Personally I would rather it be the whole super serum crap or some other way. I find the LMD, or even a "clone" route to be done to death.
You did say that's it's possible that Loki's blade had healing powers, so it wouldn't kill anything it stabs.
LOL what?? What I said was that the theory is that the scepter acted like the "the one ring" in LOTR, in that it corrupted those who are around it, especially those who have major issues. Never said anything about it having magical healing powers.
Sorry folks, this was an outside conversation on the various MCU theories on tumblr.
While a fascinating theory, it doesn't explain what's the thing he can never know.
Unless they don't want him to die of fanboying over that he shares something big with his idol.