idea: when creating a topic, postpone its publication for a given time.
example from site vk.com in attach.
Also do not forget about the anti-spam check, so that the bot does not create a million hidden themes that will jump out for the new year.
I will not do it now, but suddenly there is someone who wants to do it?
If you make it a permission setting (e.g., by default only admins & mods) then spam wouldn't really be an issue either.