If you are into Quickshot sticks then there exists a model which has a standard PC connector, but is a digital stick and feels and plays like it's C64/Amiga brother
I have such a stick for sale if you are interested.
Also the Competition Pro stick exists in a version with PC connector, but since I have only one of this I don't sell it.
Generally, these sticks are quite rare and difficult to find
When one pops up on Ebay now and then it always climbs to astronomic prices !
I think someone once mentioned in another message board that he built or bought that adapter you posted, and he was fully satisfied with that thingy