End of workbench is loose…

So, I bought this bench for $50 from an estate sale, and it has worked well for me for two or so years since I got it. Now, I am having an issue where the left side of the bench is loose, and the only thing holding it together is the face vise. I am looking for suggestions on how to best secure the end so that everything is solid once again.

I was going to remove the vise, but the screw that secures the back face of the vise to the front face of the bench is some sort of security fastener, so I am thinking that my only option there would be to drill off the head, but then that leaves the shank of the fastener buried deep in the bench top. I would prefer to just leave the vise in place if possible. Also, that screw head that you see on the edge does extend past the crack, and is fastened with a square bolt, so that and the vise are holding everything together for now.

I am not against building some legs to support the end of the bench, as well as sending some lag screws through the loose part and into the solid part of the top.

Any and all suggestions are welcome. Thanks mates.