Anything's possible, what to the trucks look like on the bottom? There is a collector truck for old GP-9 dummies, 8130-15.
You could also doubtless cobble up pickups to the existing trucks, I've done a number of tenders to add pickups where there was no provision for doing it. I typically use fiberglass panels and cut mounts to whatever size and shape I need to mount the pickup roller.
Here are a couple of examples where I thought to snap a shot, I've done many others in various ways. The black material in the first shot is really fiberglass. That's a stack of three 1/16" pieces to allow me recessed screws to insulate the roller properly, and also the proper spacing of the roller.
This one is bolted to the frame using existing mounting screw holes on a 3rd Rail tender. The spacing worked out with a single fiberglass piece.