Maybe this is news to no-one, but it's been a week since I discovered Nano and I finally found out this is possible.
Everything on the internet is telling me the only way to fund Kraken is wiring funds or depositing crypto bought on another exchange. Well, apparently not. Just click the big "Buy Crypto" button on their website and you can link your bank with Trustly.
Sadly I am already in the middle of routing my $1k through Gemini, but I tested with 20 bucks and it worked in seconds. The fee was $0.40 for $20 deposited, so not terrible.