Just to chime in here… I just finished installing and wiring up a Raspberry Pi 2B, to run Craftbeer Pi 3. and it seems to tick all the functionality that I was hoping that Brewpi was going to give me. And I can then just use Brew Pi for fermentation, as it is made to do. I just wanted to share the fact that the B18D20 is supported, and it was quite easy going about soldering up something to make it mate with the RJ11 connectors of the probes from BrewPi with is a really nice piece of kit.
So 3 years later (almost) I got a functioning Herms brewery with some BrewPi parts, and another controller. And now I can use BrewPi Spark where it really shines, in a fermentation chamber!