As someone that once considered "would i need some sort of wheeled/tracked chair to keep playing", I'd say fuck yeah, to me airsoft is a competitive combat sport, you're either winning or not winning, losing is too negative a term, especially if you're also battling a disability, & knowing you've beaten your opponents fairly & squarely just makes the victory sweeter.
& if your not victorious, that's cool too, just know you tried is worth turning up for.
Just don't mag dump a guy in a chair, that's not cool.
Wrong side of 60 with MS plus here. I use an offroad mobility scooter to get to an area and then try to ambush (nb try to!). Can't play often or for long but I still go as often as I can.