I use modified Uplula loader on my CZ 75 mags for their Kadet .22LR conversion. It fits a double stack wide mag and just the center 'tongue' needed to be trimmed thinner with a Dremel.
Here is a pictorial and write-up of the mod created by Den Stinett at the CZ forum.
No idea if the PMR mags are wider than my CZ though? The CZ double stack mags measure .80" wide x 1.25" front to bacK. The opening in an Uplula loader is 1" x 1.5"
If someone can measure their PMR mag they'd know if the Uplula might handle it. Though whether or not it would work with the .22 Mag round? I don't know. I do agree that having a high capacity magazine is rather pointless if you can't easily fill the darn thing to capacity.