Full-span flaperons as airbrakes?

Bruce,

Your Kestrel seems to have a different setup from mine. I have a
Series 1 bird, so maybe Slingsby changed the layout with later models?
Tow release is under the left inner thigh, rudder pedal adjustment is
under the right inner thigh. Drogue deploy is on the left cockpit
sidewall above the air vent, just in front of the panel; drogue
jettison is in the centre pedestal of the panel to the right of the
landing flap handle (with the nose vent control pull-knob between
them).
For me, it's a quick movement of the hand from the spoiler lever
forward to the drogue deploy; the drogue jettison is a bit further
since I have to reach the panel just to the right of my stick.
My spoliers only add 1 kt of sink, so I have to judge my location and
height for when to put on full flap. I like the comment in my POH
(sorry, can't quote it just now) about the spoilers being ineffective.