Unless you actually port your barrel, I dont know any brakes that aren't removable. Your problem will be, if you want to remove and refit it frequently, some like the DE are indexed. This means that the brake has to end up the same position each time you fit it (It has a top and bottom). Some brakes are the same all way round and you can just screw them on and go for it. Some brakes use a clap style so once you screw it up to where you want, you do up the clamp (Sako).
The problem with indexed brakes is every time you fit and remove is the 2 surfaces which meet of the barrel end and brake will wear very very slightly and then you brake will take a little more of a turn each time you fit. Eventually when you fit the brake it will turn around too far.