OP, how did you approach this junction?
The OP has answered this question above.
I was attempting to defeat the no right turn.
Previously the road markings & signage clearly stated that only buses could do the right turn at the junction of Prince of Wales Road/Stratheden Road, onto Shooters Hill Road.
So it was a common practice to crossover the junction & traffic permitting, turn right slightly further down on Stratheden Road, into the slip lane that exits onto Shooters Hill Road.
Google Street View location below I think shows the junction before the cctv cameras were installed.
https://maps.app.goo.gl/pNeaAMisZgXnbfed8
I guess you could be hinting that if the OP had come from a different direction, the NRT signs might not be so clear?
The only other direction the OP could have come from is along Shooters Hill Road, due East, taken a left turn here, then "whoops a daisy, wrong turn" immediately turned right onto the slip, to regain the same road as before.
Shooters Hill - facing East at junctionBut I think the NRT signs are clear.
Nb. It is not permissible to take the right hand turn, from Shooters Hill Road due west, as NRT except buses at this junction.