I called up Deans to see if they had plans for making a 3 pin Ultra connector. Although he was not allowed to disclose any details, it sounded like it was coming soon. A Deans 3 pin (pole) Ultra connector would be perfect for switching from brushed to brushless while still staying compatible with all of my gear and my friend's gear.
So, in the meantime, I made my own connector with some superglue and a dremel.
Here is my setup with a Brushless
And here is my setup with a Brushed
I'm not sure about the Novak GTB, but for the LRP Sphere, all you have to do for a brushed motor is combine the blue and yellow wires. From one of the male Deans connectors I disassembled, I used a spare connector to short the blue and yellow wires:
This could also be done with wire.
I'm really happy with the results. The superglue holds extremely well, and now I can easily interchange my brushed and brushless motors with my new Sphere. Additionally, the 3rd connector on the brushed motors does not interfere when I use a brushed speed controller that only 2 connectors. I'm looking forward to when Deans releases their 3 pin version of the Ultra connector.