Re: Re Parachutes: It has been done. At least twice.
Yes, I know 002 well. I'm fairly familiar with Yeovilton.....
read my earlier posts: the escape hatches were incorporated into the prototype Concordes at the planning stage and were specifically designed not to weaken the fuselage. If you tried to retrofit such a device to the production birds you'd end up destroying several frame sections and irretrievably weaken the fuselage.
Such hatches were included in the V-bombers for the back seat crew. The success rate in using them as an escape method was low
And just as a point of clarification, 002 wasn't a "passenger jet": it was a flying laboratory and while superficially similar, was actually very different in design from the production Concordes