If this helps, here is what I did on my DM10 kit.
I wanted a double bass setup, but am on a tight budget at the moment, so I can't put money into a double kick pedal just yet. However, I was able to get a killer deal on an additional single pedal, the same model as the one I already have.
I have a mesh snare from my old Roland kit, and I attached it to the other leg of my rack and split my kick input.
For me, this is hopefully just a temporary solution, but it works very well for my setup. The music that my band plays doesn't call for a whole lot of double bass, and I am still in the learning stages of the technique, so once I start being able to use it more, I'll eventually upgrade to a double pedal.
I hope this at least helps as you work out your solution!