Hey,
I don't dispute the virtures of a ported barrel on a high pressure cartridge range gun! It sure helps get back on target doing doubles. In your LE days, did you not do some firing from retention during quals? If not, give it a try and you'll answer your own question. We frequently fire from retention as a matter of routine in our qualifications, that is with the weapon indexed against the top of the holster and duty belt. One shot with your ported mdl 31 in this position will light up your life, not to mention your shirt! I don't own any ported weapons, other than my AR. If that's all I had, I'd carry them. Good choice in weapon and calibers though! I have a few Glocks myself and most frequently carry the 36 for CCW and a 21 for duty.
Stay safe,
Savage