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in reply to @wordbending's post:

instructions i used were:

Go here https://accounts.nintendo.com/
Select Japan
Redeem icons
Set the icon however you want
Switch back

but be forewarned stranger! "switching your region will force you to use any money in your account's wallet before you're allowed to switch, and will apparently break the NSO app's menus and leave you unable to change your icon unless you swap back to JP again. Auto renewal will have to be turned off for your NSO membership and your NNID will be unlinked"