So I went ahead and ordered a Sig OEM P365 Grip module and a few 10 round mags from Osage County Guns; they arrived yesterday. I put my P365X FCU into the module, and will see how this goes shooting tomorrow. I also need a no-kidding kydex pocket holster, so I am planning to buy a Vedder Pocket Locker.
I will also do some dry timings for comparison. I like @Clusterfrack’s suggestion to start from the pocket, hands on grip, and AIWB, hands at sides. I plan to compare using the four Gabe White standards, same as before. I’ll include runs of my G19 AIWB in a JM CK AIWB 2.5, and my G34 in my USPSA rig. More to follow.