I have used my linked dipole with the 60 or 80m extensions with my 6m pole and used walking poles to lift the ends a little. It worked fine.
The question as regards use of 60m is also in another thread regarding use by a visitor in Ireland. As CEPT TR16/01 does not specifiy which bands a visitor can or cannot use, rather than the rules for a full licencee in the country being visited applies, as long as a band is a “normal” band and no NOV or special licence is required, it should (IMHO) be available to a visitor who doesn’t have the band in his home country. The key point is the rules of the country being visited apply.
That all being said, while travelling, even if working for several weeks in a foreign country, you’re probably best sticking with the equipment that you know works reliably on the bands that you know rather than taking extra antennas for extra bands. I’m sure you’ll get plenty of contacts into Northern Germany, the low countries, Spain, Portugal, Scandinavia, the UK, and back into “eastern” Europe.