I thought about an adjustable GB as well but it would need to be accessible under the handguard. The noveske swithcblock, but its expensive for what it is! Plus they have to be accessible to for the little wrench thing. LolLots of options. I use an LMT enhanced bolt which is superb, and I also have the Rubber City Armory gas stake key bolt, but I don't have much time with it. Their gas stake key is a cheap way to try the bolt option.
Also there are the adjustable gas blocks options.