111 - Sorry, you did ask that before and I have been slow to answer.
I never did LL aeros but I was in the end of course aeros comp at Valley so I was reasonably good at them (then).
Assuming I was current on the Hunter, I would work out a sequence and get it approved by peers. I would probably spend 2 or 3 hours trying it out to see if it all hung together at 10,000' then 5000'.
When competent at those heights I would practice over the airfield at 1-2000' with aforementioned peers critiquing in the bar afterwards. So, about 6 hours so far. Then I would do a couple of practices at 500' then ask you (or someone suitable) to give me a DA. Thereafter, throughout the display season,I would run through my display over the airfield down to my limits at least once a week after work.
Probably fallen into your trap but that's about what the real display guys did back in the day. Would cost a fortune which is why present day civilian display pilots don't do it, I guess.