I have had good results replacing the rectangular thinkpad charging port with USBC configured for 20V delivery. The boards are so small they fit within the foot

I have had good results replacing the rectangular thinkpad charging port with USBC configured for 20V delivery. The boards are so small they fit within the footprint of the port, and sugru works well to hold things in place and provide a nice rubber finish. The last piece is using a third party usbc magnetic connector.