"Don't use Snap", you say? I'll do you one better! Skip Ubuntu. 'Just' use anything else more suitable. Debian is an excellent replacement being upstream, but I hold no illusions over undeclared requirements.
With 24.04 at least, doing an 'apt purge snapd' seems to be quite useful. Is that not sufficient?
For the moment, later pulling a package that is redirected would undo that effort. As the peer points out, too, that would likely rip out stuff you're using without having already configured preference.
One could maintain a boundless list of configs pinning repository preferences... or they could use a distribution that doesn't have a predisposition towards Snap.
A packaging system should not break the basic abstractions of an OS.