Wanted to point out that edefault has purchased another set of PMC RM7000C-600T CPUs and is gearing up for another run of 600MHz O2 modules. You’ll need to supply your own RM5271 module for the conversion.
More info can be found in this thread.
I’ve one of edefault’s conversions in my clear cased O2 and I couldn’t be happier with it. The image below is of my own board - the “blue wire” mentioned in the thread can be seen on the module toward the bottom.