I dare say some kind of bypass valve might be required to not deliver 12lpm of glyc into the flame

To only success I've had with pumping glyc for a burner nozzle was with a car windscreen washer gear pump, but that kept slipping the gears on the motor shafts with liquid as dense as glyc. I've also tried a dispensing machine vane pump (popped the front cover circlips off), so I've been hunting a small gear pump...
But, that said, with the house move and the work the new place requires, I very much doubt I'll have time to play with atomising burners for a while.