OK, the Kimber Officer's Mag arrived today.
I slightly enlarged the top of the mag catch slot until the mag stayed in place.
I then slightly reduced the sides of the top of the mag until the slide traveled freely and picked up dummy rounds from the mag.
After trying to manipulate the metal follower lips of the Kimber mag, I put in the follower from one of my P45 mags.
Although I haven't shot it yet, dummy rounds seem to feed and eject and lock back after last is gone.
The mag only holds 6 instead of the 7 that it should and I might try to address that with spring alteration.
First I want to take it out to the range this weekend if the monsoon stops and check firing function.
As the photo below shows, the bottom of the 1911 mag has a slightly different angle than the bottom of the P45, but it's close to flush.
I ordered a couple P45 followers and one for a P9 mag, as I have an officers 9mm 1911 mag on order to try the same process with my new P9.
Fingers crossed!
Kahr P45 with Kimber Mag.jpg