I was in your situation two years ago. I would put my FFP all the way until close to boarding. When I leave the lounge/approach the gate, I have them print a new BP with my FFP removed.
I would then use these tickets to back-claim my miles/points as CX credits by posting date and not activity date.
I think this approach still works unless someone here has a data point to nullify this now.
Win-win unless you put value in the DM unpublished benefits on-board...