Why not use the M3-to-M2 figure? It's basically M3's head on M1/M2's body. That way, you could use the football uniform you have.

I don't think there is a football uniform for M3, but I've used the DAZ football uniform with M3-to-M2, and it's worked pretty well. It's not like you can see the body much anyway, with all those pads. :-)