In Sri Lanka earlier this month I cut the crown out of a cotton hat and sewed it inside my usual cycling cotton hat so that the top of my head was well protected (photo is of original hat).  The outer hat had a brim and I always wore sun glasses.
I used either a summer long sleeved cycling top from Endura or an Indian cotton white shirt.  The Endura shirt was better - it was cooler and washed / dried faster.
Gloves - had to search but in the end I used some ‘racing’ gloves from Madison which had vents in the sides of the fingers and gave uv protection on the tops of my hands.
I used a neck tube around my neck that I could raise up, or a face mask that went over my nose.
Endura Humvee long legged shorts so only my legs below the knee were exposed.
No sun cream.
Only sun issues were on my exposed legs when the sun was lower.

I know a guy that has had several skin cancer spots removed, he wears a lot of sunscreen with a high mineral content.  His skin is much whiter after he applies it.  For the last year or two he has also worn one of these to have less sun on his face and neck.
https://dabrim.com/products/cycling-classic

His jerseys are all short sleeve, he often wears some things that look like arm warmers but they are quite thin, I suspect have no significant insulation but has high UV shielding properties, they are white in color. 

I think you just need to look for clothing that has a high UV rating.  Most jerseys are a mesh that would allow a lot of sun to pass through.

I know a guy that in really hot dry (but only in dry) sunny conditions wears a white 100 percent cotton dress shirt, but a cotton shirt like that would not work well in humid conditions.  Attached photos.  The day I saw him and took those photos, I was really jealous that I did not have a shirt like that, it was a very hot dry sun.

If you have a thin spot on top (not much hair), remember to put some sun screen on top too, unless the air vents on your helmet are small and few.  I have big vents on my helmet, I often add sun screen on the thin spot.  A skull cap under the helmet would be better.

An article on e-bike motors, with emphasis on mountain bikes, written from a North America perspective:
https://nsmb.com/articles/emtbs-dirty-little-secret/

Hey All!

Rhode Island (USA) custom framebuilder/Constructeur Brian Chapman is known for his process videos. He posted a new video to his Facebook and Instagram page today, detailing Brooks repairman Simon Firth's efforts retopping a saddle for Rivendell's Grant Petersen.

You can view it here...
https://www.facebook.com/watch/?v=4219251298314709
...or here...
https://www.instagram.com/chapmancycles/reel/DV9MCkAkThD/

Except for the water dunking (I do it "dry" by Proofided), this details the same method I've used to replace the broken chrome rails on a half-dozen of my own Brooks. The ones I owned were made during a time when Brooks' chroming method resulted in hydrogen embrittlement of the rails and predates the switch to black powdercoat or copper plating.

Enjoy!

Dan.

H - is it time you contacted Rohloff direct and describe the problem to thrm?