you cannot rent a motorbike in europe that I know of ,and go wherever you wish . either go with a tour company like edelweiss or rent a car
cost wise I spent can$ 3000 round trip for the rocket , and regular fare for me. which is half of the bike fare . no issue with canadian driving/riding license no problems with a canadian license plate on the bike either. but have to be in possesion of european insurance for the duration of the trip. the whole thing well worth the money in my opinion , this is my second trip there and I wholeheartedly cannot think of a better way to visit germany/ austria/ italy/ france/ spain and others countries not listed here..