For anyone who saw the small, simple but cheap footswitches from CPC but discounted them because they are latching, a conversion is simple.
I bought a second one and the procedure is this:
Remove e-clip from hinge pin (careful it doesn't fly away) and remove pin and separate clamshell halves.
Remove screw holding switch in place.
Use pointed implement to lever out the detent wire from the switch (appears brassy/coppery in colour, probably beryllium copper wire).
Refix switch, reassemble case and hinge pin and refix e-clip (you didn't lose it did you?)
I now have one of each.
Neil