Hello barbudreadmon,
In Mame I created it as a new driver to bring the least possible impact on the original cps2 driver.
Unfortunately I have already tried and I don't have enough knowledge to rewrite it for FBNeo.
I stopped updating sf2mix because there was no place left to design and create new things, with SFZ3Mix I didn't want to fall into the same problem so I expanded the rom to create a really fanciful and unrealistic piece of hardware.
Unlike older consoles, having real cps2 hardware is not very common and most people use it in emulators.
Whenever possible I leave some changes optional for the player... team or single mode, optional custom music, 16x9 or 4x3 screen...
I don't expect any urgency, just the possibility that one day it might be recognized on FBNeo is enough for me.
I know what it's like to be from your point of view when people ask me for countless new features in the rom and don't even think about the complexity and the effort required to do it.
To be honest, this one might require too many changes to our cps2 driver, it is basically running on fantasy hardware.