Bluetooth earbuds don't have to cost "hundreds". I use
these Jbuds, although admittedly not under my helmet. I've simply never tried them there because I've discovered that I don't like having a GPS in my ear nattering away at me. I use these for Zoom and for my mobile phone. I used to use a Bluetooth comm headset on my helmet, with speakers and a boom mic, but that voice in my ear drove me crazy. I have enough issues with the voices coming from inside my own head 🤪 The only reason I used it was because at the time I was on call at work, and it allowed me to take off on the road and still answer the phone and solve problems when the network went out at work. I also find music in my ear distracting while I'm riding, so never used that feature, other than trying it to see if it worked.
These particular earbuds might have issues related to putting on your helmet, since they have 'tap' controls on the outer edge. I'm just using them as an example of what can be found. If putting on a helmet would interfere with the controls, perhaps look for a set with a "band", where the buds are wired together and there is an inline remote control, like
these for example. If I was going to use something like this under my helmet, I'd want something that wasn't wired to the bike. I have enough problems forgetting to unplug my heated gear when I dismount. I haven't broken a wire yet, but the power cord is a lot stronger than the flimsy wires one might find on speakers.
