I also have a few of these and tried to do some wrangling of DTHs to make them work, but I had some issues and have abandoned these, for now. Not sure it was driver related, could also be hardware as I could never get them factory reset properly with the correct blinking pattern.
It seems that one problem HE is having is with a certain encapsulation of Fibaro codes that is not supported yet (Crc16Encap)
In the meantime I have been using my Fibaro FGBS-321 as a temperature monitor and that works very well with 4 temp probes with the correct driver and setup steps.
As I will most likely want to try again to get the FGK working, I would be very interested in a driver port if you get that far.