i would avoid the fan idea kim, thats not safe for hams due to the moving parts, and wiring or batteries, and also fans don't create oxygen, they only move air aroung.
I understand you have been told you cant have children and etc, and i'm glad hams make you happy, however, i don't think its a good reason for breeding, and i certainly don't think it can be a job in the sense of making money from it. I personally get much more satisfaction from rescuing hams that desperately need homes and would be mistreated without me, than i ever could from making new ones