He might get unemployment/disability benefits pretty easily here in Finland, but he'd go absolute mental trying to figure out the bureaucracy to get it and would probably need to find actual real professional help to live here. The bureaucrats will threaten to sink your tugboats for tiny little screwups, and those happen to normal people frequently enough. Also, unemployment benefits only go to the people who are registered as job seekers and are expected to be able to receive full-time jobs.
Finnish citizenship would be pretty tough for him to get, though. It will take a bit longer to get if you're not married to a Finnish citizen (just as picky as everywhere else in the world, thank you very much) and more improtantly there's a language test (Finnish or Swedish). I have no idea how strict the test actually is, but Finns generally find it a little bit disconcerting when people speak Finnish as badly as Ricardo Weston Chandler hablaños Españolos.
Still, socially, I don't think he would have much problems. We're a pretty introverted nation to begin with.
Also, since he's over 30 years old I don't think he has to go to the army any more, but I would have loved to hear what he would have said to the military to avoid conscription - it's not unusual that people get out for health reasons (and personally I don't condemn them for that, especially since I think the conscription is a bit outdated thing really), but some explanations are undoubtedly more colourful than the others.