Personally, I'd junk the spares, its not like your going to sub-Sahara Africa, most of the counties are well served by Yamaha dealers and if you think those components are going to fail (clutch cable) change them now. If your in the UK you wouldn't think twice about doing that sort of mileage between services. I did 4.5K to Malta, visiting all but Slovakia and Hungary on your list, back in 2014 and only had cable ties, puncture repair kit with additional CO2 bottles, cheap (£10) compressor from tescos, front & rear spindle sockets with large breaker bar. plus obviously standard tool kit with added 6mmAF Allen key, can't get tank off otherwise.My GEN 1 had a good service beforehand and a new chain and sprockets and had done 35k before the tripJust make sure to get a recovery/breakdown insurance and most of all just get out there and enjoy!!!!!!!!