I've just checked aliexpress today and it's only 387E + 83 Euros shipping to France !

I paid around 700E + 20E shipping to France on bikepro.de and had a good contact with the seller (he said he tested the K3, etc ...)

Too bad its OLD isn't 135mm and won't take a Shimano Nexus/Alfine gear hub.

That derailleur so close to the ground is a disaster waiting to happen.

The 2021 edition has a welcome welded baggage lug:
https://cimg0.ibsrv.net/gimg/bikefor...daaa3c0b75.png

yeah I noticed it can touch the ground when the rear tire is not correctly inflated ...
I suppose the issue can be "lessened" if I take a 14x1.50 tire instead of the original 14x1.35 ...

I'm thinking about getting the K3 locally, or possibly finding a shop that would ship a K3 Plus overseas.
I saw a few blogs attempting to convert the cogs from 9-13-17 to 9-11-1X, but the 9T has a chamfered ring that presses flush inside the 2nd position 12T or 13T cog and so won't fit inside the smaller 11T cog. These blogs settle for 12T instead.

Since this ring behind the 9T cog needs a surface to press against, simply cutting off 2mm all around the ring would not work because then it would just slip through the hole of the 11T cog. What about cutting off 1mm and chamfering the edge? Then it will have approximately 1mm overlapping the 11T cog, although it would push the 9T cog approximately 1mm outwards?

https://jikoman-life.com/dahon-k3-sprocket/
The markups to the images are my hypothesis. Not confirmed whether or not it will work.

https://cimg9.ibsrv.net/gimg/bikefor...50dd4f9851.jpg

https://jitensha.net/k3-change-sprocket
https://cimg2.ibsrv.net/gimg/bikefor...c2cfa3e4b7.png
https://cimg3.ibsrv.net/gimg/bikefor...34caab53ac.png

Owners seem to enjoy them.