Pickups for 3" x 1" route?

I bought an old junker of a guitar with very non-standard proportions.

Trying to swap out the electronics but can't seem to find any pickups that will actually fit in the pick guard.

Seymour Duncan mini-humbuckers were just slightly too wide and way too short.

The routes are 26mm x 80mm (90mm screw to screw).

My only other option is to try for another pick guard with more standard routes, but then I'd have to plfigure how it works with the (again, very non-standard) body shape.

Any help is appreciated!