Curate, connect, and discover
While I definitely agree, there are times as well they have been encased in lightning while being suspended or simply not moving at superspeed, like a precursor to their powers. I don’t think it’s so much as a friction thing versus the Speedforce giving them this sort of barrier like a thin protective shield that can be transferred through touch (and that’s why they can carry people without them getting burned or shredded by the velocity). Since the speedforce is sentient it simply knows when to raise or lower that energy shield.
Now onto transport; while it’s true no HUMAN devices could withstand the full force of the Sun, there are friends on Earth that can get him there AND withstand the sun as well. For one, Kon, Jon, or Clark; kryptonians are sun children! they can fly him there and even give him kryptonian tech/suit for breathing purposes since it seems all their shrap was also built to withstand it. Option two! Apollo, aka Midnighters husband. One call to Tim like “hey can your gay uncles hubby yeet me into the sun? For science.” Tim literally caves to every single one of Bart’s requests (for “unknown” reasons, I mean cmon he just asks and Tim let him fly the batjet)
I rest my case, your honour. Any rebuttals?
So if Speedsters can surround themselves and handle lightning just fine when they throw it and stuff, and lightning is 5 times hotter than the sun, theoretically a speedster should be able to survive on the sun. I’m Bart, and in this Ted talk-