This topic has been discussed millions of times on every forum and the debate over which ear plugs to wear.. yawn..
I can't stand things in my ears, makes me crazy, takes the fun out of riding. Maybe i could get used to it over time not sure. I read that some people get ear infections from custom plugs too.
Here is a product that addresses the problem externally.
Essentially ear muffs that you pump up to cover your ears inside the helmet. If they offered a Helmet that had a sun visor I would consider buying it.