MM on 5s truggy

just curious and would appreciate some help ....i am in the middle of a CRT X1 truggy conversion ,my set up is ...Nue 1515/2.5/f and MMM v2 on 5s...if when i finish it and my MMM fails(which it sounds like it will ) can i use my MM from one of my crawlers as a back up as long as i use a fan and bec....on 5s and would it be a reliable set up ??....i ask this because i'm afraid to spend any more money on this conversion and not be able to run it till CC figures out the MMM problem (if they even can )...thanks for the time and any help