happy 1 year anniversary to me trying to answer this ask but I saved my response to my drafts and then lost it! so this is a new answer.
I did try to coin this but never really liked the flag ideas i came up with. I was thinking of calling it 'altworldian' from alternate world/reality. or something based off the word 'otherworldly'.
for example you would say something like "my altworld is _____" or "i am _______ altwordian" and you would fill in the blank with whatever fictional/other world comforts you or that you have a connection to. it could even be something related to your paracosm if you neuronarrate/have madd, or something related to a hyperfixation/special intrest
and yes it would be a neurodivergency term unrelated to gender and exclusive to schizophrenics/schizospec people!
so yes I guess this is the coining post? anon if you see this I am very sorry for losing the ask in my drafts and I only found it again last month
if I ever come up with a flag I'll make a fancier coining post :>