Big Uncle - that wear/abuse on the threads does worry me. I'm not sure how much more I think a takedown style would be than a switch barrel style?

I don't know how often I'll swap barrels back and forth, probably not more than once a year, or more than every few years even, but I do quite a bit of traveling, so I could take advantage of a takedown much more frequently. So if it were a takedown, I'd exercise that option a lot more than if it were a switch barrel.

I can also see an advantage of having the "seam" interface at the front of the action for the takedown engagement could act like a secondary recoil lug (ala Rem 700 style). But I don't want that forend wallering around at all, and don't want accuracy to creep if the threads have a specific shot-count lifespan.

I wouldn't be looking at a 1/3, 1/2, or 1/4 turn style interrupted large thread, I'd be looking at a standard threading, just with a sandwiched set of "locking plates" between the barrel shoulder and action.

Maybe I'll give it a try on another rifle before I commit these two rifles to the idea.