There is no more requirement to be trained on the RHS, CPL and RT licence is accepted by GCAA, as long as you act as PNF.
Now that's interesting when the LHS skipper has to take a leak .... as we are not inflight potty trained as well!
Wait for the FCI stating that the PF can't leave his seat in such configuration.
Next time you attend a manual handling sim, volunteer for assisting a buddy on the RHS and see how well you perform. I had a very hard time finding the correct buttons and was fiddling with wrong fingers, looking into wrong directions etc.
It is not the safest approach to flight safety at all. If US passenger rights lawyers get wind of EK putting tech crew on seats they are not trained for, I would not want to be in a eventual courtroom, even as skipper accepting such assignment, after all we know we are not recent enough there.
Food for thought.