The "Replace Controller Thing" or the "Replace Display Thing" are both plateaus that I have not reached on any of my eBikes - yet !
Controllers and Displays are two areas where the eBike Space suffers from a lack of Standardization for sure.
1. FYI - 2016 Cross Current Info Page Attached.
2. Canadian outfit hilleater.ca (250) 538-0911 were the Canadian Juiced Distributors back then - and back then and thru to today they are enthusiastic eBike people (which are getting rarer and rarer).
3. Might be a clesner shot to wire in both a New Controller and a New Display - don't freak out - does not have to be a arm & a leg - and it's a heck of lot easier installing a new controller with new display than work/around a generic controllet to a mysterios display or vice versa.
4. Have you actually had your controller Unplugged and in youre hand showing all the Controller side wiring connectors ?
One reason I ask this has to dso with the "deeper engineering" Juice does on their connectors/hookups - by either adding metal twist locks - or modifying a standard connector by adding a 2nd alignment notch.
It will go better if you are able to have that controller in your hand and be able to snap clear detail photo of each connector on the Controller side and clear photo of the matching connector on the Cross Current Side - or just go All Fresh In