Thank you for your reply.
Generally i will use the kids in wheelchairs as pawns, as some are a bit chubby and hard to move far, which is why it is not possible on soft wet ground.
Playing indoors, well the club we use is too small, and there are other activities.
Some of the kids enjoy it and help me choose the move, some are quite good players. There are a few cheeky ones who move squares and sometimes it gets heated, some of them have right tempers.
As for making noises , only the seriously disabled ones make noises, but they generally do it throughout the game