So far, I have only one piece requiring a G natural in 30 years of playing.
A single action on the low 7th D would be marvellous, but has never come to fruition.
I have never needed a 0G#, I just keep it tuned to 0G. It is a bit annoying to tune the rest of the harp in C flat, then put the G, C, & D pedals in Natural and tune the three strings on the harp which have NO discs. Otherwise, I do not miss the discs on those three strings, 7C, 7D, and 0G.