Wrenching vids can be good for views, I've done a few which have had great responses.
I'd possibly suggest with running a single helmet mounted camera with audio feed from in your helmet to start with, then if you enjoy the whole process of making vids etc, then maybe get a secondary camera like the Insta360 X4 as they are more a b-roll camera and also require a lot more editing than a fixed lens camera.
Other views may vary, but I've found better results from cheaper mics than the more expensive, this is due to the use we run them in, they are normally designed as lav mics to be placed away from our mouth, so in a helmet we can overpower them... the cheaper mics are less sensitive, so don't peak out or clip as much.