I think the correct answer is:
Yes, you can put 2 CMRs on a 5pin XLR (or at least a 6pin)
NO, you should not connect them to a 48V phantom power source, unless you acquire a Naiant PFA to step down the voltage. I have no idea why you'd want to do this anyway with a Neumann power supply
The optimum small solution for running Schoeps and CMRs is the Naiant tinybox, which you can plug the CMRs straight into through a single 5- or 6-pin XLR. I'd contact music@naiant.com for more info.
You can also run the CMRs through a Naiant PFA, but unless you are gung-ho about using them some high-end preamp, it's not really worth it to do that. In the case of just a 48V power supply, it's definitely not.