The only legitimately reliable ways I’ve seen to do it with AICS mags are magazine well “sleeves” like AI/Cadex do, or complete magwell/lower swaps like the Eliseo RTM. It really is a shame but someone will flesh it all out I’m sure
Depending on how the magwell is setup it’s an easy modification to lengthen the magwell to CIP spec length. I had to do exactly this on my Ultradyne chassis. Took me a little bit of work with a file on the edges of the magwell but it works fine