Or one PK2 with a 8-pins-or-whatever-you-need multi-position rotary switch (like old display selectors).

As you manually plug a fresh board, turn the dial to that position and click PGM. Unplug the PGMed board and replace with a fresh one.

You can only do so much manually anyways, so you'd only need 1 or 2 extra outlets. This could be wired on those dev PCB breadboards.

Not at my PC, can't google right now. Wife hollering something about "pick up all your darned PC crap from the kitchen".