Agreed. Another option that's more doable is having the small shank receiver re-threaded to large shank. That's actually pretty easy for a good smith to do. I've had that done a couple times with great success.
I ran across this same problem when I decided to build another .338 Edge. Long story short, I just bought a brand new .338 Lapua 112 Magnum Target. I paid $899 and the rifle is a 3 bolt single shot solid top action with a red target trigger. I always prefer single shot if I plan to run longer heavier bullets.
Decided to run the factory .338 Lapua barrel for now and see how it shoots. I did increase the freebore so I could run 300gr SMK and Bergers without them being jammed too far into the case. You can rent a throater for about $40.