Ah! I misunderstood. Are those nodes present in Lightburn? If so, this may helpful:
There is a similar feature set in the offset dialog that may shortcut it a bit. IME, it’s not perfect but with careful tuning can significantly reduce nodes. Unfortunately, I have zero experience with Fusion or this particular workflow, so I can’t really help on the CAD end of this problem…which is a bit frustrating since I spent a couple decades working with CAD. Just nothing terribly applicable in this instance.