what will probably work is proof of savings, proof of "registering" with employment agencies, and also any letters of support from family who are willing to help you while you get on your feet. they want to be assured you or him will not apply for social welfare upon arrival, since it sounds like you may be on a fixed income. anything that shows you have some sort of safety net for when he settles in canada. obviously it will be difficult to prove employment in canada, so perhaps he can get letter from his current employer stating he's gainfully employed, and have him explain he plans to stay there until approval. he can send his tax returns instead of NOA,since it's obviously not available. I would recommend writing a statement together to explain your plans financially.