[Serum]

You can simple use a Y cable on the brake servo/controller to use the mechanical brakes.

For some advice on the conversion you are planning to do;

If it's your first brushless vehicle, i would convert what you've got'. that way you've got a perfect reference to decide what you want, nitro or electric.

Since you have got lots of spares for the MGT, i would convert that MGT before getting a revo. You can learn from your conversion, and build it back to nitro if you do not like it. (i don't think that will happen though) and there is always room to get a revo, you know..