Serious question - is burying a plane fuselage to create an underground bunker a common enough thing that there is a usual way of doing it?
No, but the aluminum in the fuselage requires all these mitigations and it’s a well known problem. Without them, galvanic corrosion weakens both the aluminum and the concrete.
No, it is stupid idea.
I wouldn't call it common. It is a time consuming hobby at best. However I expect a lot of people spend time daydreaming about their future bunker that they never build and I would expect a plane to come up with something to bury quite often. Many of those are enough of engineers to figure out details like this.
Even this is the first time someone actually does it.