an angle grinder could do the job but cover as much as possible the expose part of the mill as the fine dust it will create is really bad for the dove tail
as for using a mill no the mill wont be able to mill it self as, unless the head of your mill is able to do back and forth movement and sideway movement, normaly its the table that moves and not the head
if you use a grinder go slow and let it cool down from time to time so that it wont affect the metal structure
you can also drill a bunch of hole along the place you want to get rid of and then finish with the grinder
The opinions expressed in this post are my own. -Les opinions exprimé dans ce messages sont les mienne