One question, and no offence to our Canadian friends, but why?
Ok, the Upholders were dodgy to start with...but then again they had been sitting at a dock for about half a decade so that's to be expected, but they are still quite good boats, slap on an AIP and they'll be rivals for some of the gear coming out of Russia.
Ok, you've got the limited range problem, but why would you want to deploy that far? Plus, you've got the advantage that if the US ever needs one of their carriers sunk then you have the tools to do the job.
Diesel boats are going to make a comeback, I think one of the biggest mistakes of the RN was canning the Upholders (well...one of the biggest mistakes of the 1990s anyway) and even the USN has realised that by lacking a diesel sub force to train with they have become weak to diesel sub threats.
Keep the Upholders, once the kinks have been worked out, they'll be quite the asset.
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