Granted, it would be rather dumb to be going online with anything pirated on the switch, but dual booting is a pretty fair way of going about it if you already own games/ want online options. Just takes extra memory in the SD card.
Definitely recommend it.
Take some of the questionnaires from more legitimate ADHD resource sites. Where I scored highly likely to be ADHD, my partner did not at all.
That being said, you could also undergo psychiatric assessment with a psychiatrist, but it may be a little expensive. I would recommend it if you can, because medication and appropriate psychotherapy can greatly improve quality of life.