For what its worth..
I don't think that I would build a switch barrel rifle on a conventional action for non target/range use. If I did, I would definitely have two scopes and detachable ring setups that provide the best chance of consistent re-zero. While that works for my R8 because said mounts are fixed to the barrels, the same can't be said for your proposed setup.... you might have to re-sight every time anyway.
What I have found in the past, is that any requirement to re-sight a rifle for a change in bullet load etc, is nothing but a curse even if the range is only 10 minutes away. Not so much a problem if we are talking about range rifles obviously, but for hunting/varmint set ups... just a curse.
Even with the Blaser, I have ended up with dedicated scopes for each barrel to avoid that..
Appreciate what you are trying to do and for the money involved it may be worth a crack, but it may well be something that you get sick of quick enough....
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