Don’t bother trying to replicate alpine climbs; there’s no need.
I’d probably get used to doing several hard days riding back to back though.
Make sure your bike setup is comfortable for seated efforts on grades of 6% – 10%
Get used to climbing out of the saddle for extended periods
Make sure your abdominal muscles are quite well defined on your departure abroad 😉 I actually think that’s really the most important point. Alpine climbs are pretty easy really, or at least you can ride up them at a leisurely pace if you want to (not like the 25% hills here which always hurt a bit). But if you’re carrying alot of excess weight, then they can be quite the opposite