Call it a senior moment, but it did not occur to me to use the retention plate from the Beretta mag in the CZ mag. I'm betting that doing so would prevent the Beretta mag's baseplate from sliding back and forth. I'll give this a try when I get home later today.
The Trausch grips do interfere slightly with flipping the safety on. I don't really find this to be a problem as I have relatively small hands and a commensurately small thumb, but I can definitely see a shooter with a larger thumb perhaps having some difficulty manipulating the safety.