DNS traffic is funneled through a different Tor circuit than the web traffic. You'd need to apply the bad DNS to all users, which would almost certainly in your exit node being dropped from the network.

I'm also not sure how this would be handled with HSTS preload lists -- HSTS preload applies to all subdomains so you'd need to come up with a completely different domain (and protections against homograph attacks mean that avenue is restricted). It'd probably be simpler to just set up an actual website with LetsEncrypt than to bother with stripping the TLS in this manner.