RRAAMJET
a chicane-wrist-flick to deploy the roll-spoilers symmetrically...it's British and it works...
Uumm, this sounds like you are saying there is a stand-by system that:
In the even of losing most hyd. power, you can extend two spoilers to lose speed/height. These are retained in the wing by a latch that is released by a specific movement that is not a part of normal handling. Specifically, to flick the (say) port wing high and immediately low and then return to level?
It does sound
very British and dashed ingenious!