The starting DBR on any ride does not have to be for fuel. Fill up off the clock near the pie shop. No DBR required. Ride the short distance from the gas station to the pie shop.
Buy the pie, check that the DBR has the required info (location, date and time). If so, start eating. Take a happy selfie - ooooh that pie tastes good! Take a pic of the DBR next to the odometer. Check the pic is clear and shows all required info*.
Ride at least 200 miles to your next pie shop and repeat. Through the day you will need fuel, possibly nowhere near your planned pie stops. Log the stops with DBRs at the gas station in the usual way.
If you are worried about the "2 pics for one SPOT", buy gas near the end and take the usual DBR pic. Even if the pie shop is very close by, there will be time for another 'spot' by time you are half way through that very goood final pie with smiling selfie.
* I write the odometer and GPS mileage on all of my DBRs before each pic. Also the log entry. 1, 2, 3 etc. Takes a couple of seconds, but makes everything in the pic clear for the verification team.