Fireballs isn't influenced heavy in DOA though. Akuma's fireball in Tekken is manageable even on hit without stepping because you aren't immediately knocked back..with the exception of linking attacks from it into launchers due to meter usage for Akuma specifically on Tekken. Raidou's fireball on the other hand isn't that incredible for usage in DOA because it's slow and requires a certain play for it such as unholdables which grants him advantage well over +15 for a guaranteed jab near a wall or corners if they decided to block upon getting up, the raw fireball itself has knock back which leads to guaranteed damage near walls but extremely slow in usage because DOA doesn't focus on that specific play for fireball zoning and the like. Not to say Akuma in Tekken copies the one in SF for fireball wars, but some of that stuff has to be toned down for the Tekken characters to approach, as well as the SS game coming into play to make things more sense.
While I do think Mai's projectile wouldn't be anything like Raidou's mediocre version, I still don't think it would be heavily influenced for usage. Akuma's fireball even does chip damage in Tekken but Tekken format has a easier approach to avoid such things. DOA has a lot of free movement so who knows really.
KOF Maximum Impact could be a good choice actually. Though I'm sure Mai won't get that quicker speed priority there for startups in frame data.