Two capped queen cells mid-August with the old queen still laying — let the supersedure run or pinch and requeen?

Kent, third year, five hives. Inspection yesterday on my 2024 queen's colony: two capped queen cells, both on the FACE of the comb (not the bottom bar), colony not congested, no backfilling, and the old queen is still present and laying — though her pattern has gone noticeably spotty over the last month. Everything I've read says face-of-comb plus a failing pattern equals supersedure, not swarming, and the standard advice is to let the bees get on with it. But it's mid-August. By the time a virgin emerges, matures and mates we're into September. There are still drones about here but numbers are dropping. Do I trust the bees and let it run, or pinch the cells and buy a mated September queen while they're still available? Losing this colony to a failed mating in autumn would sting.