Offer is always there, mate!
personally I don’t find the mag capacity bothering me and if anything it adds to the excitement as well as increasing your skill level.
I’ve found using mine has made me a much better player. I think about my loadout as a whole. Where my mags are, how fast can I draw my pistol, where I’m putting my empty mag etc. With a good setup and the instincts that will come over time with using a low cap, you’ll be a much better player as a whole regardless of what gun you’re using.
Are you behind cover? Check your shots. About to enter a building or general enemy area? Mag change. If your gun shoots further than most, use it as an advantage. Get out of their range and then fire on them. There’s nothing more satisfying than playing for hours and realising you haven’t actually ‘died’ yet, because you’ve been playing smart.
As for the hpa mag... while it doesn’t really interest me, you could mag clamp a stanag high cap to an mws mag, get some tubing like what m249’s use and have the high cap feed into the mws mag with a bit of dremelling, and then tap the bottom of the mws mag for a hpa valve.