I have not played much ISA, (just the Ironman, to be exact), but if you wanted to list a few backups, I can tell you that there are some guys on the IceBreakers that I would take.
P-David Magill- True, I have known him since I was 6 and I play league with him, but he throws a pretty sick knuckleball.
C-Wes Escoe- When he keeps it in, he can solidify the middle of an order
OF-Adam Watson- Pretty solid outfielder.
2B-Brandon Harper- He plays SS for them, but he is a very good second baseman and makes more plays at 2B than he does SS
I do know Scruffy that plays with the Crackers. He is a solid hitter and can play almost anywhere. The pitcher from LoneStar is good. And anybody that can hit the ball for a hit to the right side with runners on 1st and 2nd needs to be mentioned.
ISA is alot of fun. Unfortunately, my team sticks with USSSA. It would be fun to come and play some of your good teams. Maybe one day.

Be safe this weekend, and play hard