Ok for this to work, you need three RM roles so sadly this won't work in Ranked / Practice.
What you need: GF or Mafioso, Forger, Disguiser, Blackmailer. and a Jailor calling TPLO
Kill a random person and Forge that person as Jailor.
Blackmail the real jailor and disguise the BMer so LO won't see them visit
Town will definitely know that the d1 Jailor was lying and he can't defend himself since he got Blackmailed.
If he had a Lookout on him, he won't see the Blackmailer, maybe even accuse some TP or escort as BMer.
With that, town might hang the real jailor
Also the only problem with this? Spies. They'll see the double MV on the forged person