You can't adjust a gas system with a screwdriver unless you have an adjustable gas block. If you increase the size of the gas hole in the barrel you could then be restrained by the hole size and chamber of the gas block. To get beyond that limit you would need to increase the hole or chamber of the gas block. If you start getting too much gas then there is no way to go back unless you want to replace the barrel and/or gas block. Why anyone would make permanent alterations to their rifle for one type of ammo is beyond me, but go for it if you want.
I've never heard of an adjustable gas block failing and if it's good enough for competitors who tax their ARs to the limit then it's good enough for anyone. Further it's not like they were invented last week, they have been around for decades.