We had a boat years ago with a similar situation due to a minor step up with a floor. During a interior remodel the chair in place was a concern as it was just not a smooth get off and you found yourself sliding off to find the floor with your feet. I see the same concern on the bus, awkward height. Solution, we had the chair butt height shortened. This is really not an expensive undertaking to make the additional slide height now user friendly. It appears the same could be done with this slide/chairs.
Just a idea if this was a deal breaker with considering the purchase.