Fakeclaims aren't Normal (basically because they're a modWIFOM rather than direct way of giving information about the setup; the Normal alternative is to give the information directly with a role like Informed).
The balance of the setup seems like it's in the right space, anyway. Town are particularly likely to try Follow the Cop (because the Cop will probably claim D2) but in this particular setup, they gain neither an advantage nor a disadvantage from doing so, so it doesn't really matter.
I'd have no problem with this setup if the fakeclaim were removed. I'd recommend against trying to replicate the fakeclaim with Normal mechanics, as scum have easily enough information without it and telling them that there isn't a tracker (or similar) is more likely to guide them into an inappropriate fakeclaim than it is to help. (That said, although I'd
hope
scum would be smart enough to fakeclaim the Rolecop as a different role, I suspect that many scum actually wouldn't do this in practice. At some point I'm going to have to find time and mental energy to write a Mafia Discussion article on how to fakeclaim as scum.)
