After suffering through considerable frustration getting the connections sorted out, and a brush with Webpal-death when the adapter I was (which dangles loosely on a cable) using flopped into a short of the +5 supply, the idea of something that fits properly is looking more tempting.
AP Ciruits will want a base charge of about $55-60 (I need to find out the exact shipping cost), plus about $2.50-3.00 per board.
Even if we can't rally the 25 people needed to bring the final cost down to about $5 a pop, I might be able to panelize this board with another one I'm planning, so it may still be possible to do it at a not-too-painful price.
I think I also have a local surplus source for the header sockets needed to make it removable from the Webpal. I can even do kits, or assembled units, if there's a need for them.