Crab
MSFL has nothing to do with the safe minimum height for abandoning your aircraft. It is the lowest usable FL that ensures terrain separation within 25nm of the primary NAVAID at the airfield for which it is calculated.
Similarly, Safety Altitude (either en route or in a given sector around an airfield) is the lowest altitude that ensures terrain separation in that given area so that, in case of disorientation, you can hit the SA and not the ground.