Not to be Debbie Downer, but I started down the exact same route as you and found that running a 16" was subjectively but appreciably less loud than a 14.5" pinned and welded.
I would respectfully suggest a 16” midlength gas system with a click detent adjustable gas block and a muzzle break instead of a flash hider might be worth your consideration, since you are planning to run suppressed the majority of the time.
Having an MRO, I would also suggest that a "go to handy for all times and all purposes" rifle might be better served with a 1-4 or 1-6 LPVO vice an unmagnified optic. A PSA 1-6 FFP with an ACSS reticle would be a good choice for this build.
I found those two changes made my rifle more pleasant to shoot, more reliable, and more capable for engagements from 0-300y with negligible changes in length and weight.
(If you're already into the 14.5 P&W upper, the above would be the second upper that I build for that rifle.)
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