I’ve actually seriously considered this. I like the 17 grip profile better than the 19, but the 19 grip length is easier to conceal. Also, I’d have it cut like a G26, where the backstrap overhangs the length of the mag, giving me a slightly longer grip, without taking away from concealability, since grip + mag is the same length anyway.
Plus, I’m a big fan of front cocking serrations, which my current 19 doesn’t have.