I also want to know this. Did you ever find out?T-Rex, did you find the answer to your question? I want to know this too.
How easy is it to redownload something you bought in another region once it's removed from the Nintendo Switch? Do you have to change the system back to the region you bought it from or can you just download it from any region's eshop? - if the latter; does this give you access to any language version of the game you like (eg buy the JPN language version and then download on the European eShop)