Charity Skydive

I did a tandem skydive a few yeas ago.
Initially, I didn't think I needed a doctor's certificate because the company I was jumping with emphasised age (need a certificate if over 40 years of age) but hidden in the darkest depths of their website I found something which also mentioned medical conditions including diabetes.
I expected this to be a formality and dropped the form off with my GP to be told I had to make an appointment.
At the appointment, the GP (who knew nothing about my diabetes control) was more concerned by me having a hypo than looking at anything like HbA1c. At one point, a thought he was not going to give his consent when he said that I was going to have all the fun whilst he took full responsibility. Thankfully, consent was given after his long lecture and I had an amazing day.
I hope you get the chance to job - jumping out of the plane is scary but once you're out it is a wonderful feeling.
Fingers crossed for your latest blood test results. Hopefully, showing your doctor your recent improvements will show him you are motivated to controlling your diabetes.

My brother gave tandem skydives back when they were new. 95% of the time is on the ground and going up in the plane. The actual skydive only takes a couple minutes and you are strapped to the instructor so the only concern would be a hypo IMO. I suspect the medical form is mainly for people with respiratory/altitude problems not diabetics.