Flybywyre
Interesting point. I only worried about the NDB holds because I did them in training. If you're not commercial/professional (like me) and are only likely to be asked to orbit (which I've done several times), then do I really need to worry about keeping proficient in NDB holds? Your question begs another one that, if you have an IMC on the basis of safety/contingency, rather than regular and necessary flight in IMC conditions, then can you rely on vector approaches (SRA) (and keep practiced of course) rather than worrying about all instrument approaches? If memory is correct, on qualification for the IMC you get to choose one type of instrument approach anyway.
Interested in views on this.