no you can't do anything to increase the size of the V's memory and unless you are very specific about which areas of The Continent you wish to have in street by street detail you are right, it won't get you too far.
But there will be bits you are travelling through, for which the basemap will be adequate, and there will be places you want to explore which will probably be no more than 19mb unless you are going for a very long time.
otherwise you have options....
take a laptop.....
get a 2610........
use a map........
take a chance........