I understand your dilemma.
There is a part of me that wants to jump on the MRGG-A band wagon and get a 14.5” 6.5cm barrel for my MWS. Shave the rails off and lighten it a bit… it will still probably be a heavy beast though.
I think barrel profile and suppressor selection will be pretty important. My 18” 6.5 CM is one of the easiest semi autos I have to shoot accurately (and isn’t crazy heavy) so that has me intrigued as to how a 14.5” would do