Hey - just saw this post and I'm getting used to checking in on here, rather than just lurking. I have my MA in Music technology and innovation and this is a little up my alley. If you muff and use proper recording technique, you shouldn't have to use much in your post process, if anything. It'll sound like you went back to a studio and recorded your vocals later. Not sure that will be natural for your viewers, boss.
PSA - Watch out for, and please try to avoid sidechain compression to raise your vocals. It's just bad on the ears with that pulsing.
ANYHOW
I wish I had some clear "on the road" examples to show you **right now**, but trust me, you can do it without a buttload of work in post, if any.
Anyhow, I use Giant Squids a LOT in the field in Hollywood, for video games and even in my helmet. I also have used the Sony lav mic in the past. Both are quite good. No need to buy anything else. Try using the stock foam on the Squid, then hitting up your local Joann's fabric store for about 1/16th of a yard (roughly 2") of fur and making your own deadcats/muffs. That 1/16th of a yard will be like a lifetime supply and it will be about $2.50 in 2017 money (in case a time traveller is reading this).
Another flaw in the system can be how you are bringing your audio to your camera. 1st and most expensive idea is using GoPro's mic to camera conversion box that is like 4"x1.5" wide. It also creates a lot of parasitic drag and noise that gets transmitted to your wires, helmet, camera and mic. Second choice would be the Amazon "Fantaseal with ferrite bead filter" which just works perfectly and I have no complaints about:
(I do not have the post count yet to post links, sorry)
BUY TWO of all your adapters because you'll always have one go out and need to replace it on the fly. These things are out in the wind, buzzing in the static (yeah, that dust makes static and will make it doot-doot out one day)
. I'd rather get a new mic.
