Spoilers for what? Assuming your “old Trek” cutoff is Nemesis, we’re already talking about 20+ year old content. So what exactly are you trying to avoid spoiling?
I don't think a universe exists where creating a separate "Old Trek" community would end well, regardless of the intent behind it.
I am the queerest bitch you have ever laid eyes on and I think I could keep the anti-wokeness out of such a community.