I travelled from Austria to Luxemburg. Luxemburg to Switzerland. Switzerland to Sweden. Austria to Germany. I have them always in my carry on
Only one time they ask me what this is - it was in Luxemburg - I explained them - was okay
I tried it the first time with used syringes,… no one cares.
I’d definitely screenshot that and print it out.
Wrap the needle package up in that printout.
Maybe you can nip the argument in the bud. Once they publicly take a position, it’s gonna be alot harder to get them to back off of it. Just human nature.
Edit*
Maybe you should take an injectable medicine with? Saline solution, perhaps? Something small and innocous, that doesn’t require a prescription in any jurisdiction you might travel through.
I’ve travelled with a huge bulk of chip injectors in both checked baggage and carry on. The checked baggage always gets inspected and a note left inside from TSA but carry-on goes through the x-ray and nothing… not a word. I just pick up and walk. The only time I get stopped is when I have my DIY electronics with me in my carry-on.