@1olbull @albertaduke
Wish you guys had come during the last 4 years, lol!
As Alberta said transport may be a better option. If it were me I'd plan 30 days to ride if you can swing it. Even at 2-3 weeks, transport may be cheaper than rental.
The alps are phenomenal. But I'd also say don't miss some other spots. Croatia is a hands down Must Ride!! Also in Germany, check out the Hartz region (central) and of course Schwarzwald. The huge forest between Germany and the nederlands is also spectacular!
Plan for July/August and you'll have no problems with the high passes in the alps! Campers and trailers; well that's another story, but no avoiding!