I guess that depends on which country you're going to land in to start your trip. BRP has a site for finding dealers but it doesn't include some countries so it's not much use. I know of several dealers in the UK and the UK is not listed on their website. (It's BRP, why am I not surprised!?) Also, the Garmin navigator which came with my Spyder has the details of European dealers inbuilt, should it be necessary to find one. If you post here which country you're likely to land in, I'll look at the Garmin and see what I can find that may be useful to you. Belgium is the European BRP centre, quite what that entails I don't know but our bikes and spare parts are distributed from there afaik.
Edit: I think google might be your friend. I've come up with a number of Spyders for sale in europe - here's one web site which lists several from both private sellers and dealers, if you select a bike from a dealer it will give the dealer's details. At the bottom of the page is Spyders by country - might be helpful. I'm sure there will be other sites too. Good luck searching!
http://www.theparking-motorcycle.co...f3-s-se6-special-edition-mecafun/R74NNQ8.html
Edit 2. Aha! I've come up with this...type in your country and search.
https://uk.brp.com/content/canam-sp...ntal_only&placeId=ChIJl5fz7WR9wUcR8g_mObTy60c