Paletized bench tools

You could make small tool mounting tables that temporarily attach to the sides of the main bench with loose pin hinges.

Anvils commonly had a through square hole (the Hardy), and a shanked tool could be dropped in there and (depending on design) held by a wedge through a slotted tang.

An inset hard spot on top of the table, and another hard spot on the underside, and you can shank-mount any fitted item.

Another scheme I've liked, is to put a magnetic base (one of those machinist dial indicator bases) upside down, and a variety of tooling can be positioned on it, and locked by flipping the lever. Not gonna work for heavy vises, though.

A third approach is a few rows of holes with tee nuts on the bottom; then you can take a gizmo-on-a-plate to the bench, position it between two rows of holes, and use ell sections as holddowns to clamp the plate. Or buy commercial holddowns:

I've found that painting the wood with white glue (or cementing some fine sandpaper to it) makes the friction of wood-on-wood quite satisfactory for clamped items.

I have seen a system using trailer hitch mounts. You mount several receive r tubes under the edge of the bench. Mount Grinder, vise, arbor press etc to male mounts with a suitable mounting plate. When you need that tool, gra b it from under the bench, slide it in the mount, insert pin.

I am goin* to do something similar using some telespar tubing

I have a couple of seldom-used power tools that are palletized. My system is to mount the tool on a steel plate and weld a piece of angle to the bottom of the plate. To use the tool, the vertical leg of the angle is held in the bench vise. It helps that I have my bench vise mounted to the side of the bench, so that its top is even with the bench top.

Oh, wait ... a more careful reading of your post reveals that your bench vise itself is palletized. Pallet on pallet is probably not a good idea.

For my bench grinder, I did that same sort of thing, but added a lip to the pallet, that hangs over the bench edge. This makes it a kind of half-bench-hook, so pressure on the grinding wheels doesn't walk the grinder back from the edge. It still takes a C-clamp or two, and looks ugly, but my workspace isn't a candidate for Shop Beautiful cover art.