You know what, yeah. This is a bad plan. If Ex is mafia, they're lynched. If Ex is town or 3rd party, nobody is dissuaded from lynching, because Ex doesn't vote or help find mafia, and something surprising is implied to happen if they're lynched. Nothing is revealed about you or the person you target that changes anything. Nobody is confirmed trustworthy from this. Even if Ex is mafia, which I find highly improbable, they'll probably be lynched later anyways, because people like to lynch Ex. The fact that you would spend over $1000 on this, rather than save for any other items, seems to speak very poorly of your priorities.