Received an update from my dealer today... fairly prompt actually... after 24hrs from seeing the truck, contacting FCA and confirming with the dealers bodyshop, the rear window replacement was ordered, confirmed in stock and should be arriving in 2 days.
I will add, for any Canadian owners, Kathryn from Ramcares provided me with all the information that I needed to verify the correct window part and STAR case which I immediately passed on to my Service and Warranty managers and I am convinced this tactic expedited my case and should provide me with the best chance of a successful repair.
After the window is replaced, a water test will be performed to confirm the sharkfin and third brake light are not leaking as we discovered some slight water marks around the rear passenger headliner speaker.
If any Canadian customers are in this process (which my dealer confirmed is extensive, they've replaced "many" already) please PM me or contact Kathryn through Ramcares for the information that should help you get the job done right.