Unlikely with an LCD: but you might look at a 'Hoodman loupe' that's designed more for the purpose. Or use any built-in feature the camera has, maybe with a hood.
Also, I don't know if Pentax ever made a focusing magnifier for a conventional enlarger, but that wouldn't work the same way, and there'd be no point to it zooming. So that's probably for something else.
Basically, even a nice LCD screen is pretty-low-res, so magnifying the view only means seeing more dots. Correction that'll let your eye get closer and something that might screen other light might help, though.
