The only pressure on that type of button is downward.
If you get a semi-tight fit on it, the tabs that hold it into a metal panel should provide enough friction to keep it from backing out.
I've been running leafswitch buttons press fit for years, and not had any problems.
They have the leafswitch attached to the wood, and pushing against them, so I don't forsee any problems with an internal micro like you are wanting to use.