Well, two good steps today.
1. I got on the list to be notified of a proper Burris plate availability at CZ Custom.
2. The 75B Shadow Springer mount that Earl offered to let me try arrived today after all. I had to take a few mil off the back end of the mount to get it to clear the rear edge of the P-10F slide, but it fits perfectly other than that. I'll see if I can zero the known good P-09 sight on Sunday morning. If I can, then this setup should let me survive until the proper adapter plate is available. I'm thinking I just bought this mount from Earl as a result of my precision file and fitting job. I am 95% sure my sight mount aggravation is over. This one will do nicely, thanks to Earl's generous offer.
More on Sunday, then I am away for a week.
Joe