If you just want a proof of concept, it might be feasible to pay someone to whip up a demo, but you’d likely need to start over if the project ever went further than that (due to reasons already mentioned). So we’d be left with a situation similar to where we started, just with more interest in the project. It feels to me like—if a fan game was to happen—it would be better for fans to create everything themselves from the start, even if it takes longer. That’s going to require people who want to code in their spare time. It’s a fairly big ask for a professional who already spends their week working on other people’s projects, and likely has their own side project ideas as well, to spend their evenings and weekends on a fan project, although it’s not impossible to find people like that.