A flathead screwdriver version of Max's heartbreaking
nestled
allen wrench idea. (Had already been done
unfortunately.)
Turns out there's a socket wrench version as well.
There's also been a multiple pin version of the socket
wrench
suggested as a screw driver here but I don't think you'd
have
much strength.
This would be a continuous flat piece of
steel which I think you'd need to get any use standing up
to the torque you'd be dealing with.
Could be available in flathead or Phillips Head,
potentially both in one.
Alternatively, a simplified flathead/Phillips version could
just have the phillips bits spring loaded to push out of
the way when encountering a flat head slot.
I'd be surprised if somebody hasn't already thought of
this but just in case, here it is.