The primary problem is the switch. How necessary is the switch, since I believe no other aircraft type has it? If it's necessary for the 787, replace it with a more robust switch. That would be the seat supplier's responsibility, wouldn't it?
The secondary problem would seem to be what looks like an awkward location of the power cutoff switch, as if nobody anticipated any emergency use. Maybe it would have been easier for the steward behind the seat to operate the switch.
Redesigning the tray should be lhe last consideration, shouldn't it?
The seat seems to take a total of about ten seconds to go from fully backward and outward position to fully forward positon; five seconds to move inward then five seconds to move forward.
It looks to me that, when the seat is in the forward position, there is no room for the tray to go under the control wheel so that is what it would come in contact with.