The normal guidance is to apply the correction to altitudes inside the final approach fix.
That might put you in some real uncomfortable situations in some parts of the world. Temp -25C (that's 40 below ISA = 16% addition) and MSA of say 7100ft (in a place I go to alot) gives you a lot to think about.
Remember: correcting for low temps, low pressure and strong winds is the responsibility of the flight crew. These procedures were
not made up to make your life harder.