I’ve not, but, just thinking with my out loud keystrokes here; How do you deploy the gun from said storage without sweeping either passenger to your side, in the rear or yourself? Even if it’s just to holster up.
I’m not trying to be all gun safety puritan here, ... ok, yeah, I am. But additionally, to me, the kind of gyrations to make that work seems awkward.
best guess, scandium J frame mounted at the bottom may work, allowing the lid to open, it’s just a tick over a pound loaded. Pocket 9/45 like the XDs or Hellcat ... maybe. They’re about 20 ounces unloaded though and I’d suspect the lid is not going to like staying open with that much weight on it. but that’s a guess.