I'm not comfortable having a party as partners at this time, given her requests for privacy. I'm not going to downplay my relational status with her in my own home, as you say.
I think you're right to stand on this CL...I find it odd that she is so ferocious about her 'privacy' in regards to your marital status. It has never occurred to me that the two concepts are related, and though I think it's important to respect her for who she is, it is certainly unreasonable for her to expect you to play a role other than that of a husband in your own home.
I think you're doing a great job of finding ways to respectfully assert yourself, it seems to be paying dividends. Keep it up!