Another option, don't remove it at all... Let me explain. The VW DSG transmission does not have a fill plug. It has a snorkel drain plug arrangement similar to this transmission. To fill that transmission there is an adapter to push fluid in from the drain plug with snorkel, on this car that would be the small center fill level plug inside the larger drain plug. You could make a tool with tubing and do same. Then you would not need to deal with the fill plug ever. Just a thought. Hope it helps. Also the dremmel slot seems a good idea, but getting in there with even a dremmel would be difficult. Concur on concern for a weld that close to sensitive ECU, right next to battery.. that could be a serious problem.
Sent from my Moto G (4) using Tapatalk