Thats exactly what I've done to get the two discrete signals from the "Fishman" to the "Raven"...All one needs to do then is to pan the Fishman Blender pot fully clockwise (or is it anticlockwise?!!) and let the 2 signal paths of the Raven do the rest..
So Jed this might be the best solution for you? It certainly works for me!!
And anyway, the thought of drilling XLR size holes in my Fyldes and the Sobell makes my eyes water!!
Plug where plug is due. I was recommended the Raven system by Martin Simpson, nuff said I think!