What kind of thing is it he does?
My big sister's hubby was in a similar boat, always worked with his hands, no qualifications - not even a city and guilds (so I was told) and he's started up his own handyman business and is doing really well. He's always busy! Could something like that work? It means that my bil can have no two weeks the same! Same as my little brother, although he has a level 3 in carpentry, he's started his own business and is turning work away. He put up the screens in the bar of several pubs, last week he was changing facias, he's done decking and is currently taken down my sisters conservatory and turning it into a proper extension for a bespoke kitchen.... Might be something to think about?