Bite mount, I have the same one - you can heat it like a football mouth guard and mold it to your teeth. It's way more comfortable than you'd expect.
You can fold it and clip it to your impact vest (I use it in water) when not using it.
Apple air pods pro are a bit expensive, but totally worth it for me.
Kevin Langeree (the first guy in your video) uses JBL
Endurance DIVE
Lots of bicycle folks recommend
JayBird X3 as a cheap but good headset because they're sweat resistant , or the X4 if you want waterproof as well.
Foil: Speed5 18+12 | Speed3 15 | Sonic2 9m | Peak 5 4m
Arc: Phantom I 12m+18m
LEI: LF WOW 9m
FB: Flux 5m | Bullet 4.5 | Blurr 3.5 + 2.5 | Rage 2.5 | Beamer 1.8
Ride: Flexi Haize | MBS core 90 | SS Vision 140 | Mako 140 + King 165 | King Gee | SS Hover Glide | WB 5'6" | Burton Floater
NAPKA NCC-US1701