This is probably the best place for that discussion: (maybe an admin can move?)
I agree with @Maxence hopping with the brake engaged is the way to go. It will probably feel like you are hopping mostly on your front foot. You can also do (small) stillstands, again with the brake locked, similar to a fixed uni, save energy by doing short stillstands between your hops.
Anything resembling idling is likely impractical.
I think small hops in place will be fine on any hub, at least to me it seems like they don’t produce all that much stress on any parts.