Anybody have thoughts about upgrading M620 Ultra from UART to CANBUS?

I zapped my controller on my Frey HT1000 and mistakenly purchased the wrong protocol controller replacement. Have been reading about the differences between the protocols and CANBUS provides easier access to settings adjustment using the BESST tool. How much of a pain in the butt would it be to replace the wiring harness? Would battery connection be an issue? Thanks for any thoughts and recommendations!
 
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