Threading a sporter is always something of a pain, but that would generally be my choice. You don't need as robust a shoulder as you do with a suppressor, but threading an Axis for even 1/2-28 would not leave much steel to support the device. It's also probably the most expensive option because you need to have the work done and buy the parts, but there are some reasonably good but still very cheap brakes on the market, and the ones I've found have had oversized apertures, so a .223 brake might work for a .243, but whoever does the work on the barrels should also make sure it is the correct width.
Various clamp-on brakes have strong followings, but I don't like how big and ugly they are. There's only one big, ugly thing on my rifles, and it's me.
I can't speak to porting, its efficacy, or its cost.
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