I emailed Mike@CZ about an SA only conversion for the PCR.
He's done it, but it is a fairly special job (apparently, it was supposed to be impossible).
It involves converting the ambi-safety to single-sided, and the Champion hammer and trigger. He estimated the cost around $200. I don't know if he could drill a hole in the frame to get an ambi-safety on the PCR - that sounds kind of dicey.
My gun money has all been spoken for at this point, but if someone wants to let their trigger finger get flabby from lack of double-action exertion - the option is available...
Steve