Thanks for the input on the BM.
I agree that the rooting gel shouldn't harm the cutting. Since the cutting was about 10" long, I cut it in two to have fresh ends, scored the last 1" or so and used q-tips to coat with DynaGro gel. I potted them in a mix of 35% Vermiculite 60% Perlite and 5% generic potting soil, just moist enough to feel that it's moist. They went in the heated sterilite tub and will get lightly misted with the other cuttings.
To test if my potting mix would work, last week I buried three 2" single node cuttings (from a variety that I got sent 3 long cuttings), all with what looked like buds forming, and all three have leaves and roots already.
Being new to figs I know I shouldn't be put off by a difficult variety like BM, but I just have to do what I can to make it grow. If this fails I'm going to plan B-just ignore it until it grows!
Thanks again!