Would a U-shape work? You'd have more floor space for the wheelchair, and the second peninsula could have a lower counter, if necessary. Also, if the clean-up peninsula has prep and dish items out, the second peninsula could be used for items needed for son's feeding.
If you could spare a bit space from the dining room, the fridge could be moved down, with shallow storage in the DR:
Even though this plan gives you the space for the semi-circle overhang, I don't think that looks comfortable for either seat on the ends--not enough knee space.
Q
Free around thermostat.
Q