The first option is the only one that is allowed by the program, but the points should then credit to your partner and you may struggle to reimburse....
A whole host of similar questions and conclusions as this is a fairly frequent topic
FAQ: Does Spouse get Bonvoy Benefits without me?
My status benefits on wife's reservation?
Platinum Benefits on Stay in Wife's Name
Booking under wife, but I have status
Ultimately, it is a bit of YMMV (Your Miles May Vary), but I would observe that the priority should be the reimbursement rather than the benefits, pointless getting "free" lounge access if you don't actually get reimbursed.