You can get some pretty great headlamps that help with light, around $75 for something with decent quality, battery and bright enough. I typically get most of my running in while the kids are asleep which means very early or late runs. I’m lucky enough to live in a place with well lit running paths all night though so I haven’t had much experience with unlit roads. I do trail running with a headlamp sometimes though which works well enough.
For the sun, I’d highly recommend covering up vs sunscreen. A long sleeve lightweight shirt + a bucket hat would go a long way, or those weird running sleeves that people wear.
I don’t have an issue with bleeding nipples myself, but I’ve heard people swear by products like nut butter or body glide. I just use normal Vaseline when I’m having chafing and it does the trick.
I’m trying to think of any possible advantage of this over just putting it on the back wheel and I can’t. It’s beautiful.