I'm afraid a Type B is necessary, as it's the status of the outlet that matters, as that's where the installation terminates. Any outlet that is intended for EV charging has to comply with the regs.
The RCBO linked to is only DC sensitive in the sense that it's a Type A, so able to deal with pulsed DC as well as AC. Unfortunately a leakage fault when charging may well be when the charge point is at State A, which is a steady +12 VDC on the Control Pilot, via a 1 kohm source impedance. This equates to a possible 12 mA of DC leakage to earth if the CP was shorted at the vehicle end under some sort of fault condition, hence the requirement to be able to detect a leakage fault in the presence of DC that may be greater than 6 mA.
The key thing to look for are the symbols on the RCD/RCBO, rather than anything in the description. This chart, lifted from Doepke, shows the symbols for each type at the top:
View attachment 591240
That’s not quite how I read 722.531.2.
RCD Type A can be used with either something like an O-PEN device or a charge point with the 6 mA protection built in.