I suspect the lack of ghostlight-specific content has a lot to do with the fact that it was designed to be future-proofed with just a few word changes in the parser, so there wasn't much call to write content
specifically for it until they were actually implemented. Likewise that future-proofing is the main reason why mechanically they function like a flesh and blood penis, just one that can't get anyone but Astral Kiyoko pregnant.
Alypia's written content that specifically accounts for the fact that you have a magic dildo that can be dismissed at will, it's possible more content along those lines will be added eventually.
Oh, and technically it's not a dildo attached to your waist, it's a piercing that grows a magic penis out from the Champ's clitoris.