Although moving is appealing its unlikely Was thinking more of a tenon saw to make the v shape ... Could also cut the corners off and round it off with 60 grit sandpaper (the main shape)
This would be the way I would do it. I love working with oak, I've got a massive 5ft long beam sat in my shed drying at the moment. It's been there two years but will need a little longer yet as it was very green when I got hold of it.