Hey,
Thanks for the quick reply.
Yes, I tried contacting Snapmaker at the same time and just heard back from them:
Hi,
Thanks for reaching out to Snapmaker. I am sorry that you encountered such a problem.
The CAN message of the purifier is more complicated to interpret. This is relatively low-level R&D information. There is not much information available for technical support. You can directly refer to the code information on Github.
If you just want the purifier to work, you can only purchase a main control + power supply for the smallest system, and use a computer to send instructions to control it. The cost is expected to be around US$200, so you can also consider this.
Please feel free to contact us if there are further questions.
Have a nice day.
I could definitely consider this, although I am not sure if the CAN messages are as complicated to interpret, as advertised… Or if the 200$ are worth it for a CAN interface…
Well, maybe someone of “the many that tried and gave up to limited documentation and time resources” (as you correctly stated) still finds time to comment their two cents to my problem 
Cheers, Nils