You've been digging deep..
I know a bloke who has the viscous fan spanners, and I have a drawer full of hammers...
I DO have some 300 TDi stuff that I'd lend though. Trouble of course is geographical.
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You can use this, just take it apart
Attachment 168402
Seen here at 3:37 Adventure Defender Not Starting? Injector seals change TD5 - YouTube
this fitted perfectly for all injectors, the hook and the heel are the correct shape mine is a snap on pry bar but there are others
https://www.toolexchange.com.au/wp-c...41-100x100.jpg