diff --git a/circuits/src/hash/poseidon/poseidon_chip.rs b/circuits/src/hash/poseidon/poseidon_chip.rs
index 94fcafa1..2c46a3bf 100644
--- a/circuits/src/hash/poseidon/poseidon_chip.rs
+++ b/circuits/src/hash/poseidon/poseidon_chip.rs
@@ -179,7 +179,7 @@ impl<F: PoseidonField> ComposableChip<F> for PoseidonChip<F> {
         let constant_cols = shared_res.1;
 
         let q_full_round = meta.selector();
-        let q_partial_round = meta.complex_selector();
+        let q_partial_round = meta.selector();
 
         register_cols[..WIDTH].iter().for_each(|col| meta.enable_equality(*col));
 
@@ -253,7 +253,7 @@ impl<F: PoseidonField> ComposableChip<F> for PoseidonChip<F> {
                 .chain(input_pow_constraints)
                 .chain(once(output_pow_constraint))
                 .collect::<Vec<_>>();
-            Constraints::with_additive_selector(q_partial_round, constraints)
+            Constraints::with_selector(q_partial_round, constraints)
         });
 
         PoseidonConfig {
diff --git a/circuits/src/verifier/accumulator.rs b/circuits/src/verifier/accumulator.rs
index 51166fac..bce0c298 100644
--- a/circuits/src/verifier/accumulator.rs
+++ b/circuits/src/verifier/accumulator.rs
@@ -121,6 +121,12 @@ impl<S: SelfEmulation> Accumulator<S> {
         self.rhs.collapse();
     }
 
+    /// Evaluates the variable and fixed parts of the Accumulator collapsing
+    /// each side to a single point.
+    pub fn fully_collapse(&self, fixed_bases: &BTreeMap<String, S::C>) -> (S::C, S::C) {
+        (self.lhs.eval(fixed_bases), self.rhs.eval(fixed_bases))
+    }
+
     /// Accumulates several accumulators together. The resulting acc will
     /// satisfy the invariant iff all the accumulators individually do.
     pub fn accumulate(accs: &[Self]) -> Self {
@@ -293,6 +299,21 @@ impl<S: SelfEmulation> AssignedAccumulator<S> {
         self.rhs.collapse(layouter, curve_chip, scalar_chip)
     }
 
+    /// Evaluates the variable and fixed parts of the AssignedAccumulator
+    /// collapsing each side to a single point.
+    ///
+    /// This will likely be an expensive in-circuit operation.
+    pub fn fully_collapse(
+        &self,
+        layouter: &mut impl Layouter<S::F>,
+        curve_chip: &S::CurveChip,
+        fixed_bases: &BTreeMap<String, S::C>,
+    ) -> Result<(S::AssignedPoint, S::AssignedPoint), Error> {
+        let lhs_pt = self.lhs.eval(layouter, curve_chip, fixed_bases)?;
+        let rhs_pt = self.rhs.eval(layouter, curve_chip, fixed_bases)?;
+        Ok((lhs_pt, rhs_pt))
+    }
+
     /// Accumulates several accumulators together. The resulting acc will
     /// satisfy the invariant iff all the accumulators individually do.
     pub fn accumulate(
diff --git a/circuits/src/verifier/msm.rs b/circuits/src/verifier/msm.rs
index 6ef520bc..8edb5463 100644
--- a/circuits/src/verifier/msm.rs
+++ b/circuits/src/verifier/msm.rs
@@ -485,6 +485,34 @@ impl<S: SelfEmulation> AssignedMsm<S> {
         Ok(())
     }
 
+    /// Evaluates the variable and fixed base parts of the AssignedMsm
+    /// collapsing it to a single point.
+    ///
+    /// The fixed bases are constrained in-circuit to be fixed.
+    pub fn eval(
+        &self,
+        layouter: &mut impl Layouter<S::F>,
+        curve_chip: &S::CurveChip,
+        fixed_bases: &BTreeMap<String, S::C>,
+    ) -> Result<S::AssignedPoint, Error> {
+        let mut bases = self.bases.clone();
+        let mut scalars = self.scalars.clone();
+
+        for (key, scalar) in self.fixed_base_scalars.iter() {
+            let base = fixed_bases.get(key).expect("Base not provided: {key}");
+            let fixed_base = curve_chip.assign_fixed(layouter, *base)?;
+            bases.push(fixed_base);
+            scalars.push(scalar.clone());
+        }
+
+        let scalar_tuples = scalars
+            .iter()
+            .map(|s| (s.scalar.clone(), s.bound.bits() as usize))
+            .collect::<Vec<_>>();
+
+        S::msm(layouter, curve_chip, &scalar_tuples, &bases)
+    }
+
     /// Scales all the scalars of the AssignedMsm by the given factor r.
     ///
     /// This function mutates self.
diff --git a/circuits/src/verifier/verifier_gadget.rs b/circuits/src/verifier/verifier_gadget.rs
index df8ffcf7..ea1b84de 100644
--- a/circuits/src/verifier/verifier_gadget.rs
+++ b/circuits/src/verifier/verifier_gadget.rs
@@ -201,6 +201,31 @@ impl<S: SelfEmulation> VerifierGadget<S> {
 
         Ok(assigned_vk)
     }
+
+    /// Assigns a verifying key to a fixed/constant `transcript_repr` value.
+    pub fn assign_vk_to_fixed(
+        &self,
+        layouter: &mut impl Layouter<S::F>,
+        vk_name: &str,
+        domain: &EvaluationDomain<S::F>,
+        cs: &ConstraintSystem<S::F>,
+        transcript_repr_constant: S::F,
+    ) -> Result<AssignedVk<S>, Error> {
+        let transcript_repr = self.scalar_chip.assign_fixed(layouter, transcript_repr_constant)?;
+        // We expect a finalized cs with no selectors, i.e. whose selectors have been
+        // converted into fixed columns.
+        let selectors = vec![vec![false]; cs.num_selectors()];
+        let (processed_cs, _) = cs.clone().directly_convert_selectors_to_fixed(selectors);
+
+        let assigned_vk = AssignedVk {
+            vk_name: vk_name.to_string(),
+            domain: domain.clone(),
+            cs: processed_cs,
+            transcript_repr,
+        };
+
+        Ok(assigned_vk)
+    }
 }
 
 impl<S: SelfEmulation> VerifierGadget<S> {