A Soviet computer Vector-06c did have a CP/M port called Micro-DOS that could work with a RAM disk only.
Cold boot was either from a cassette tape or from ROM (cannot remember, though, if the operating system was a part of the on-board ROM, or one still had to plug an external ROM cartridge - either way, the bootloader could boot from both)
The RAM disk ...
I don't know the MicroBee, but grew up with CP/M 2.2 and 3.0 and its variety of floppy disk formats.
There were two different ways of implementing skew in use:
assigning the low-level sector IDs in a non-contiguous order, and simply access sectors by a 1:1 mapping from their logical number, resulting in sector ID sequences like 0 3 6 9 2 5 8 1 4 7,