Matt,
Have you got the double rifle bug?

Does your double rifle have to be SxS or would you consider an O/U?
Just wondering if you've seen the Beretta Silver Sable O/U double rifles in 9.3x74?
They are very slim and nicely balanced, and handle well.
Come with ejectors and have removable blocks in the rib for scope bases.
A few months back I could have bought a second hand one in good nick, with fantastic wood, for a tad over 4 grand.

Thesedays it may well be cheaper and better to buy a factory built double rifle than to convert a shottie, as there are more options at good prices now than what was available a few years ago.
Especially so when talking 9.3x74.