I think that by the time you factor in real world considerations such as how often the RN can afford to go how far; how many countries you actually want your F35s to exercise over; which exercises you want to go to; where and when you’ll be doing other stuff like Red Flag etc - you might find it’s all a bit academic and not much of a factor.
You may find that RN retention drives carrier battle rhythm more than RAF Harmony after a couple of cranks of the handle.
The simple answer is probably ‘They will have to follow Harmony guidelines’.