Can bitter almonds(or other nuts containing amygdalin) be made edible?
I think it most likely that the methods you describe are theoretically possible, but risky and not particularly cost-effective.  Whatever the mechanism that could be used to render the almonds safe for consumption, it seems difficult to confirm this in a home preparation, leaving you with some potential (even if small) that they'll still produce some cyanide upon consumption. This doesn't have to be acutely toxic; chronic consumption can also be harmful in ways that you might not even notice immediately.

So then the question becomes, why take this risk?  Bitter almonds aren't likely to be a significant food source; in this way they differ from things like cassava which provide a staple crop (and thus more incentive to develop effective, reliable ways to detoxify them).  Even if you did develop a method, if you can't be certain that someone will follow it to the letter and could get sick as a result, it seems irresponsible to share your steps.  Far safer just to avoid consuming bitter almonds.