The bus seats are two seats on each side of the aisle. Each seat has a reclining back, so they are pretty similar to airplane seats. The one issue I can see is that each seat has a combination shoulder harness/ seat belt.
It looks like that device uses a seat belt, so the combination might not work.
How are you planning to get onto the bus? It has a set of fairly steep steps. They also have Magical Express buses with lifts and places to tie a wheelchair down so the guest can ride in their wheelchair if they can’t or don’t want transfer.