I'm just guessing here, but I think any type of push-pull power lock should work, assuming it has enough OOMPH to move the lever. The key in the pushbutton just operates a lever, and there's typically lots of slack in the key mechanism to let the lever operate independently. Think of how you have to turn the key on a house door deadlock a full turn to get the bolt engaged, then have to turn the key back to center position to pull it out.
If you already have the bearclaw latches, study them to see how they work.
