Can't you still go to the F check-in desk to get your BP printed on proper stock and check your baggage even if you've done OLCI?
I recently did OLCI for a flight (was in J, so wanted to secure a low BN- no point doing that for F really since there's nowhere to op-up you to lol) and I had no problems checking in as normal.
The only thing the agent asked is whether or not I'd printed out my BP- I hadn't- so she printed one on the cardstock.
Admittedly there's no point in doing OLCI if you're in F, but I don't see why it would spoil anything.