The Old Clockmaker's Shop.
clicker,
Pace H&S, another thought occurs to my fertile mind.
Most cockpits have a clock these days (it was not always so, for in former times they were wind-up jobs which had a tendency to vanish, and were certain to do so after a crash). Now on our bedside locker sits a little quartz clock (Boots - £2.50; (this is infinitely more accurate than the expensive piece of machinery on my wrist). For that price they even provide an alarm function.
Why not mod the cockpit clock (or buy another, probably cheaper, so long as MOD does not handle the contract) to do this ? Bloggs could set the alarm as part of his "Vital Actions". A flashing red light might warn him that his 40 minutes were up and it was time to think about getting down.
I offer this suggestion with hope of reward, but will not order the Bentley just yet. As you say, let this be the last word on the subject (some hope !)
D.