Pedant shield to on:
'Could it be adapted to 40K?' Yes almost any mechanic could.
Pedant shield to off.
Should it be added?
Mmm. Not convinced. It is more 'book-keeping' which I am not sure is a good thing. Further, I find MC/GC - especially the latter - a much harder proposition to kill - then what they should be.
At least, what they should be in comparison to vehicles, especially dreads. I liked old 1st/2nd ed Carnifex as a dread equivalent. it made sense. But it is well nigh impossible to 1-shot a MC without D and I don't think this should be the case.
Therefore I balk at the thought of making them harder to kill then degenerating.
If this is a 'fix nids' measure then actually it should be 'change the codex' not 'change a game mechanic'.