When I went for my IVA, I had three switches that would light the warning lamp - the handbrake, the low fluid float switch and a small micro switch on the indicator stalk that had been used on the donor car for cycling through the onboard computer functions.
IVA man told me I needn't have bothered with the column switch, as it was covered by the handbrake, but that doesn't mean you can have a small temporary momentary switch in the cockpit to do the same thing if the handbrake doesn't have a switch itself.
You could probably rig up something on your handbrake with a small micro switch from maplin (momentarys - not latching. either push to make or push to break depending on which end of the lever you put it)
it'd be nice if you could, as you could leave it on after the test and you'd never forget to release the handbrake!
