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@oblomov @TheVoidTLMB

I'm happy to help.

I think you can create a first draft with Exet (use Edit > Preferences > Allow asymmetry) to create the grid.

Then, save as Exolve (Ctrl-s or Cmd-S). You can tinker with the saved Exolve file to do things like hide clue numbers and add the extra numbers that I see in your sample. Exolve supports many many customizations (https://github.com/viresh-ratnakar/exolve/blob/master/README.md)