Welcome to the forum, @Boerenkool!
That is VERY interesting! After reading @docslotnick’s post, I spent 45 minutes researching dongles. I found the LimiTTer on Github (it is beyond me), and found a couple of dongles that had tried to raise funds but none actually selling a real dongle – this is really a good find.
What is too bad, though, is that it is one-time use only: $35 per dongle, and you have to toss it every time you toss a sensor. Between the two, it’s only marginally cheaper than a Dexcom, a brand I really trust. I am still hoping that someone will come out with a commercial version of a long-living dongle!
edit: After reading Boerenkool’s comment below, I realized I was wrong – Ambrosia has a 2nd system, the Nightrider, that is a permanent dongle where you can change the battery! It costs $110, and this one is, in my opinion, a game changer if you have access to the Libre sensor.