Nowhere was I defending op, just commenting on how weird the Japanese are. You’re right about the symbol, I missed that it didn’t have a circle, although the term ‘ukronazi’ is a bit out of place; Ukraine was invaded, not invading. You’re right about weebs, this is what comes of fetishising a culture that isn’t taught about the second world war.
This sounds like a job for a raspberry pi 5 with an m.2 hat for storage, software is a less important choice here, so ubuntu’s raspberry pi flavour would be my choice. Just make sure you give it power in a form it likes.