Whole aircraft ballistic rescue parachute - GIF

[Saltfever]

A couple of things to think about, Frank. The pilot restraint system is designed to attenuate a sudden stop from the front. That stretch in belts is what lowers the G-force to the human body. If it was a flat orientation, sudden stop, it might be possible the landing gear could lessen some of the impact to the spine but it's quite possible he would have a broken back. The problem with the CG attach point is the ability to easily pitch up or down from the flat position by some disturbance like wind. If the engine was running the prop would cut the parachute lines and . . . !

PS: Commercial airlines seats are designed to attenuate a vertical force, but not so in general aviation.