GGL Partner Card Query

I’d like to nominate someone for my partner silver card. I’ve noticed that BA seems to have fixed the online issue with nominating and those in your household and F&F list appear in a drop down menu. I’d like to nominate someone who isn’t in the list. I cannot modify my F&F list as I recently made a change to book someone an Avios ticket and as such it is locked out for six months. So my question is, can the GGL line nominate this person for my silver card despite the fact that they’re not on my F&F list, or is there a rule that says they have to be on this list? I’ve searched but can’t find any clear cut rules on this and I’d really like to nominate him before his next trip.

Thank you for any help you can offer.