I probably wouldn't go for gerbils as a feeder, not easy to get for F/T as far as I'm aware and live would mean pet-prices unless you know a breeder personally. I did get chicks for variety, but both my big enough BPs wouldnt go for it, even while established feeders. It may be something yours will grab, but no way to know without trying.
I have had luck switching 2 determined live feeding BPs by thawing the rat dry, by the cage, in a small pile of used gerbil bedding. As much as you'd get a weird look, I imagine a pet store wouldn't mind letting you have some of it if you decided to try that. Especially if you explain you're trying the smell to get a picky BP to eat. After it is thawed, I just use the hairdryer to heat for 60 seconds or so until I see a nose poking out of a hide and offer. (1 adult, and 1 hatchling who had missed 3 weeks of meals and only weighed 60 grams... that was super stressful since it was her first 3 weeks with me. She has now eaten 3 times for me.)
(Both times I've used this method I've been able to immediately do non-scented the following week with even more appetite than before, even compared to the live feeders)
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