It looks like the editor is now also available as a VST/AU device - that puts it into Overbridge territory, and I am seriously wondering if that doesn’t make the Novation Circuit one of the Digitakt competitors out there. Of course no audio via USB AFAIK, but given the limitations of the standard Overbridge vs premium, it still seems like a viable alternative (for me personally, considering I could find a 2nd hand Circuit for ~AUD350 vs. approximately AUD1100 for a Digitakt).
Edit: Just realised that I forgot to paste in the link to the isotonik site: https://isotonikstudios.com/novation-x-isotonik/circuit-editor-vst-au/