What credit cards can you get that are affiliated with hotel chains? You seem to live outside of the USA and Asia.

What hotel chains does wife's airline use for FA stays?

BTW, it doesn't hurt to join every hotel program since you don't know when you might be staying in some hotel from various chains.

You might want to strategize whether to split your hotel stays between your accounts and your wife's accounts to mazimize benefits, with her account being used for the chains where her airline sends her.