The OP was about the parallel fence alternatives - I didn’t expect the interest in the stop setting gizmo. ??

But since you asked, here are a couple more photos of the prototype, and hopefully ?you can see that the telescoping monopod (with grip handle removed) is captivated with a slight interference fit in a U-channel routed into the plywood cover that is screwed down to the plywood base. ?That cover piece is two layers of 3/4" Applyply glued together, then routed out on one side. ?I also added some photos to this link: ??

These are the MagSwitches I used: ? ??They are pretty handy for a variety of things including holding featherboards and stops to the cast iron table, etc.. They come in a few sizes and strengths.