If you guys can confirm that the 910 PCB is the same (save for the corner blocker) I can ask the designer to add compat for it which is just another switch under where the 910 blocker is.
If you want to make it Exent-compatible, my instinct is that you have to rework the bottom row too. Right now you have blank space for the half u blocker to the left of the arrow cluster which Exent does not have.
This is probably right - from how I see it on the pic in the OP, the current state of the PCB accounts for a right-side 0.5u blocker, but not for an unblocked bottom row. So that'd have to change
in addition to the top right corner key.
Dimension-wise, however, it does look like the EXENT PCB fits the 910, so the reverse might be applicable as well.