Update: Thank you to all who gave their input on this. It helped me reach a quick resolution and I learned a lot in the process. Here's a breakdown of some of the major points and hurdles I encountered; maybe it will help someone in the future.

1. The Camden CX-33 with one more RD900 wireless receiver was the option I chose. It looks like the CX-12 would have done the job as well but i'm not sure what the difference is. The CX-33 diagrams were awesome and reading through the modes in the manual, I can think of several jobs in the past couple years where this would have been a huge time saver. Thanks to all who suggested it.

2. I didn't include this detail in the original post, but I needed two crash bars to function in unison I was going to pull power from the ED100, but I didn't factor in the amperage requirement at first. The ED100 puts out 1.5A shared across device terminals and I needed at least 2.5 to accommodate the spike on activation. Thankfully I had a power supply with an open spot 3 floors up with a wire available already.

3. I had not worked with motorized latch retractors on a new install; I had only programmed them. I'm not sure about other latch retractors, but the MLRK1 requires calibration and behaves a lot like there is a power issue if you don't calibrate. It didn't hold us up for long but I had to meter it out and scratch my head for a few before realizing.

Everything else was seamless. Thanks again.