Can you generate a random key that you only serve to reddit and changes voluntarily? That would pretty much just serving them noise, although unique noise.
https://github.com/tarampampam/random-user-agent
Automatically replaces the User-Agent with a randomized one.
like with all vpn blocks, I bypassed it by just reconnecting a few times until I got an IP that reddit didn't mark as a vpn yet. just an annoyance.
Just got this after reluctantly going to reddit for some info. Got around it by using old reddit