Don't shy away from crickets IMO.
My staples are dubia, but I often, despite my best efforts, end up in your situation of running out before new ones have arrived. I go right to PetSmart (despite hating the place) and buy 25 to 30 large crickets (or smaller back in the day)to hold me over until the roaches get in.
Also, I try to always have a feeder worm on hand which is usually just a treat typically, but can also help when roaches run out.
My guy is big enough now that I always have superworms on hand and usually only give him 1 a day, but if I run low on roaches I may up it to 2 or 3.
Also, are you feeding your BSFL? I don't use them anymore, but I always fed mine and they will grow quickly and quite large. Mine would typically triple or quadruple in size, which makes them more viable as a staple or at least a hold over staple. They can grow quite a bit just overnight in case you need to do it as an emergency measure.