Yep can do that.Looks OK. I would prefer the heavy duty style. I think an angle of 15 - 20 degrees might serve us better though.
If I am seeing correctly it could be thicker to match or slightly exceed the height of the nut in the 1st picture, giving better strength to the opening. 6.5 mm is 1/4", can we do 10mm? If that is easy enough I say go for it.