I’m in the same position myself. I ride a SC BLT2 normally, and spent 4 weeks last year in the Alps on it (and have also used it in Spain).
It’s pretty much up to the job 90%, but I could do with a slightly slacker head angle and 160mm fork. Obviously the BLT2 can take Lyriks or 36s which might be an option. A bolt through rear and wider bars would probably help too, but then I’m starting to turn an expensive trail bike into something it probably doesnt really want to be.
Or, if I want a 2nd bike and to keep the SC for the UK (it’s a fantastic UK bike), until today I was looking at a Cube Fritzz for £2k, seemed to fit the bill completely. But now I’ve read some bad reviews and negative comments, I’m not so sure.
Other ideas were a Spicy (not sure why someone would consider the Zesty as an “Alpine” bike) or Alpine. Both cost at least £800 more. Before that I was considering 2nd hand SX Trail possibly.