Our lawyer wanted affidavits. Based on visajourney conventional wisdom I was skeptical, but we are paying for legal advice so we complied. Surprisingly we find ourselves in a position I didn’t not expect 2 years ago: a pending N-400 with a 10 year gc in hand. So no dreaded combo interview
I would get 2 affidavits from U.S. citizens who have known the married couple since the date of marriage and who can assert their believe that the couple is living together in a marital union and the basis for that belief.
Your list is good. Some suggestions:
If one of you owns a car, consider adding the other to title. We did before we filed. Like your situation, our home was solely in my name and I did not add my wife to title for various reasons, one of which is there is annual limit of gifts to foreign spouses that is far less than half the value of our home at the time.
Your list should have joint bank/brokerage statements for the past 2 years, one statement per quarter. Same with bills of joint accounts such as utilities.
If any of you have 401ks or IRAs, list the other as the primary beneficiary. Depending on your state of residence, a marriage certificate trumps any primary beneficiary designation anyway, so might as well make it official.
We have AAA and Costco and the annual renewals list both our names.