Ridiculous is certainly a word that has occurred to me a few times from your posts. Policies also frequently could be described thus.'a fighty looking gray thing'
You realise how ridiculous that sounds?
Fact is, all they basically wanted was a ship. The RAN, a tier up and wanting (want however often being far from what achieved) an effective ship had to modify the weapons.
Dilandu sums it up well, perhaps try listening?
Suggesting Graf Spee would have gone after convoys is illiterate - the entire concept was vanish in the depths of the Ocean, pick off enough lone ships to tie up vast numbers of warships forcing them to escort (expensive in warships and is less effective for supply than a flow of ships, port efficiency for instance). Even with something of the capability of Tirpitz a direct assault on a convoy although feared, wasn’t pushed to happen.
Ref Sea Slug, I read Brown and the language is both precise and vague - based on experience of MoD with things that don’t work I strongly suspect Sea Slug didn’t. In ’82 it wasn’t even positioned or used in the anti-snooper role.
Overall, bin carriers earlier and the RN likely gets a much better surface fleet than sole T82, excess Leanders and T21s. Plus more SSNs as the infra to build 2 a year would likely have survived post R class priority.