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What about a PC from the BCP to the BCE to avoid the AF and not have to close the account entirely?
Since you're at the 5 [AmEx] revolver count, maybe two options? (1) downgrade to BCE if you're not wanting to continue with the AF and eventually reallocate the CL/cancel the card at a much later timeframe, or (2) if you can offset the AF, continue business as usual until you can reallocate/cancel the card.
Since the SUB landscape has changed in recent times, there's no telling if they would restrict any potential SUB opportunity (plenty of DPs on this) should you decide to cancel BCP prematurely to avoid the AF given you've already cancelled SPG earlier this year.