NP: I don’t think it’s fair to assume that Hashem does things he is not on record saying he does.
As far as I can tell, you are addressing my claim that Hashem would have ensured that Yaakov not suffer if he is buried alive. I think that is obviously the case, and that it does not need a source. At any rate, you can’t use an argument that Yaakov would be suffering to disprove a pashut pshat in Rashi.
You don’t have a single unambiguous source for the proposition that we should interpret Rashi / Chazal as saying that Yaacov is alive in the full physical sense of the word.
Rashi, Rashi according to the Ramban’s understanding, the Or Hachayim and the Rif on Ein Yaakov.