A brake will not do you any favors. You'll just have to try it out to see how bad it truly is. Normal A2 birdcage flash hiders, which still have some flash in the dark, are no problem with night vision. My guess is your VG6 (never having seen how much fire they may throw and with what frequency) will be annoying but not prohibitive, and shouldn't damage anything. It might accelerate tube degradation some marginal degree but not anything that would cause you to worry. Tubes last most people multiple decades if you're an average joe.
An MRO on a 1.93 will be a great solution. I use one on one of my rifles and love it almost as much as the EoTech which is the king for NV shooting.
For your LAM I would skip holosun/surefire combo and just go with a DBAL A3. Most vampire lights down range IR capability is about the same as the illuminator on A3's and likely the holosun.