Like you say they are only about 12 quid on ebay so might just buy one to try. Still need the tool tho so have mailed that site and asked why I cant buy one..can see why you want lower gears then but any size up to 22t should work with no errors.
i think edds fs has 14t? might have some spare you could try
Yep, bought the classic on from them and its a pain to use on a wrench.. the one you found looks far superior..the lbs will take 1 look at that and say wtf lol not many know they even make them in the first place
there is also this bit cost more
https://www.e-bikeshop.co.uk/eBike-Spare-Parts/bosch-spider-lock-ring-tool-active-performance
Done it....... Exchange rate at 1.14. Long while since it was so low...takes about a week when i got mine from them so not to long