@ZaiKajou , as you point out, you want to show both your and your spouse's income on form 1040 and that even with two incomes ( both in US$) you would have zero taxable income ( i.e. gross income less standard deduction ). There is no real requirement for you to file a form 2555 and try to take advantage of Foreign Earned Income exclusion.
As far as ACA eligibility goes , I am not very conversant with that subject but always though that most states have expanded medicaid ( State medicaid eligibility ) to cover those in-between normal Medicaid and ACA. Hopefully one of my colleagues (@Opus17 ) can better answer this for you.
A question I have for you is -- you seem to refer as "they" when referring to income of your spouse ---are there multiple earners in your family in Canada or what ?
