Thank you all for your feedback!
More mixers should make python libraries,it would be awesome if you could add Chipmixer and bestmixer.
Bestmixer requires an API key per user. I contacted them about this and they didn't seem interested in opening up the API.
I haven't looked as much into Chipmixer. I think it would not fit as easily in the double mixing model, given the sizing of the chips.
I will most likely add some of the more "traditional" ones if I see any traction with what I've already written.