Fiddling while Rome burns.
Better taxiway markings and 24/7 stop bars make sense, but R/T procedure? Messing about with terminology in a communications medium in which messages can be misunderstood because of poor pronunciation or sound quality, missed because you're on a different frequency, or stepped on as at Tenerife?
The actual, central cause of this accident is that the CG aircraft was on the active runway and no-one but its crew knew. If it had been transmitting accurate ADS-B position info like every other aircraft on the aerodrome this incursion, whatever its cause, would not have been missed.
Only one rule is needed: that no aircraft not transmitting full ADS-B is allowed to use the aerodrome. So why are Japan's authorities ignoring this obvious, central problem? Exactly who is being protected from loss of face because the CG aircraft was inadequately specified, or SOPs were inadequate, or both?