Jokes apart, keep at least one bike. We don't have a lot of retrobikes in Spain.
A tip I heard in a family travelling podcast and was very useful to prepare our family cycling trip of 1y in South America:
1.- Set a date. It'll never be the "perfect time", so without a fixed date you'll keep postponing the move.
2.- Figure out how to pay for it. In our case, lowering our expenses and saving a lot. For you maybe a remote job?
3.- Get rid of your crap. We sub let our apartment so we had a place to come back but don't pay rent on the meantime. So the apartment had to be mostly free, and the rest was sold or stored by the in-laws. You'll have an international move. I've done it twice and it's a HUGE PITA. And the sooner you start, the more you can wait for the right price... It'll also give you satisfaction that you are already working towards your goal.
Good luck!