So since I had a little downtime (long, gross story) I decided to figure out a simple super-cheap design - something that would let me cruise to the ice cream shop or the park with the wife, wearing regular shoes. A trip to the home improvement store netted me all the parts I needed:
1 - 7/32" Drill Bit (5.52mm)
6 - 5mm Screws (w/ nuts and washers)
And I already had the other stuff:
1- 24" Carpenters Square
2 - Cleats of the appropriate type
Tools I used include:
Angle grinder w/ cut-off wheel
Screws and drill bit were $7.00 (and I thought I had a drill bit, but wasn't sure, so I got an extra to save a trip, just in case).
I clamped off the square in the vise and used the cut-off wheel to make 2 - 5" long pieces (just a guess on my part, but seemed about right) because I needed enough extra material for some leverage to yank them back off when not being used. You can use a regular saw as well, but if you got the tools, you got to use 'em!