You should seriously consider the
QuickChange System from Inline Fabrication.
I have an LnL AP with Case feeder, an LnL Classic single stage press, RCBS Bench Primer, Hornady Concentricity Tool, and a vise mounted and in use. Just received a custom made plate from Dan that holds an RCBS Universal Case Prep Center. Each of the tools is stored on wall mounted or side-of-the-bench storage plates, or under the bench when not in use. I just slide the tool I need onto the base plate mounted on my benchtop, and tighten two thumbscrews.
There are several options for mounting the base plate, and I chose top-mounted - just 4 lag screws into the butcher block top.. You could flush-mount it by routing it into the table top, or mount it on a stand . . . there are many other options you can check out. And if the one you want isn't already listed, send Dan an email with what you want. He may already have it, or he will custom make it for you. My Case Prep Center required a 22" long plate with an adjustable support on the far end, and Dan made and shipped it to me for $40.
The plates are industrial-weight and the system works very well. Check it out, it might be the simplest answer for you.