Thank you all for the comments.
The vise had another issue that I didn't see until today. At the top where it was sheared it has also broken away a good bit of metal back into the vise (right about where Scott's lower arrow is pointing). If I were to cut it back further to square it true, it would lose probably another 3/8" to the missing metal. It is missing a spot about the width of a pencil lead, 3/8" deep, about 1" long.
My current plan is this: 1) fill the jaw area to build it up whereas I can true that top piece at a 45 degree to the lower lip (leaving the lower lip), 2) take it to the machine shop and have them precision true the top of the lower piece, and the right angle going to the top of the vise.
Where I go from there is still undecided. I had thought, as suggested, about cutting a piece from keystock and filling that are for a flat face, and then milling a jaw. My question is this, is there some benefit to doing that over just having one piece milled that will ride on top of the lower piece that is left, but also provide for the flat face jaw? I'm essentially suggesting a one piece L shaped jaw versus two pieces (one to fill and one for a jaw).
FYI - Machine shop work comes at a very reasonable rate for me. I have a good friend that I've known all my life that owns a machine shop here in town. My thought was to have them mill that one piece L shaped jaw. Thoughts?
I've left the vise with my brother for a couple of days for help. He manages a group of refinery welders and feels comfortable he can have the fill work done. I trust his team's judgement, experience, and skills over the machine shop's - I think.
Thanks again to those who commented and provided some direction. Feel free to provide more and keep me honest, PLEASE :)