If you have a Costco near you see if they having a hearing aid department. I just replaced a six year old pair of Oticons ($6K!!) with their Kirkland iPhone compatibles. The best part - $1799 for two, complete with test. I haven't worn mine riding due to sweating a lot, but the sweat band over them sounds like something I'll try.
Where did all my previous posts go? Haven't been here for a bit.