There are a couple of open questions to this:
1) ash, why did you claim instead of just keeping quiet?
2) Voltaire, how exactly does the role inheritage work? Does the surviving player receive the role of the dead player, losing his own? If so, is your role compulsive every Day or only D1?
3) As already pointed out, why target a role that is, if the claim was truthful, is useless?
4) Voltaire, what made you so sure that there cannot be a non-compulsive anti-town role?
Pending answers to these questions, here's what we could do:
Lynch ash. Voltaire becomes a redirector. We have him confirm his role somehow (can we do this? I think we can) Warning: Voltaire could lie about nothing but his alignment, thus earning him an anti-town role. In fact, if this is in fact his role, but he is scum, it makes a lot of sense to target ashersky.
Lynch Voltaire. ash becomes a Gladiator, losing his previous role (?). We can direct his Gladiating the following Days, gaining an easy method to confirm PR claims without losing them. (Challange them, ash survives, gaining their role)
I like the second option better, but will wait for answers.