I asked about using Fusion because I though that was what The Great Work and Knytt Underground were made in...are they not?
I believe both were developed primarily in MMF2, but exported with
Anaconda/Chowdren, a custom runtime. The runtime's developer lists porting work for those games
on his site, so I imagine the work involved was substantial. Regardless of the tools use, in my experience the porting process is never easy and usually comes with some pretty significant flaws, especially when custom extensions are used (which I think Saira does). Nifflas also remarked in the past that using MMF2 on Saira meant he wasn't even able to add native controller/joystick support... those are basically my reasons for thinking such a task would require a lot of time and effort, but hopefully I am wrong and it happens anyway!