Yeah, it's a tough row to hoe --- I've been handling it quite differently in my own project, taking "Design for Manufacturing" to the ultimate conclusion and requiring that the part be designed by actually applying tooling:

https://github.com/WillAdams/gcodepreview

Needs a full-on re-write to make the G-code export (and import) work well, but lately I've been focused on exporting to DXFs w/ colour/layer tagging which was just added as an import feature in the CAD tool my side-gig employer does.