I would do it this way: 1. Export hole edge as a spline 2. Select the spline and apply a 'Garment Maker' modifier 3. Adjust density until the resolution fits. 4. Attach to mesh and weld at a somewhat big weld threshold.
I daisy chained some commands together into a script that MIGHT help with automate the manual process a bit. It isn't anything too complex and there might be better, more advanced ways to generate the needed topology but this should get close to the same results you're getting manually. When executed it does the following:…