Oh! Well, making it so that we are in a false vacuum (thus creating the threat of vacuum decay) requires changing the very laws of nature themselves profoundly. I don't know how that would translate into your narrative. We being in a false vacuum to begin with, and Higgsy scheming to initiate the vacuum decay sounds more like something that could be made into a plot. Unless your universe has a way to change the laws of nature
The fool hath said in his heart, There is a God. They are corrupt, they have done abominable works, there is none that doeth good.
Psalm 14, KJV revised edition