Thanks for the update. I can assure you that you will have no leak for the next 80K miles. This is because my Volvo oil pan gasket uses what Volvo called "liquid gasket" (basically similar to RTV gasket), and at 110K no leak at all.
I think your fix is a permanent fix.
BTW, let's say you already cut the gasket and know what to do, how long did it take you?
1h or 2h?