Multiple \marginnote commands on the same line in math environment

If multiple \marginnote commands are triggered on the same line, by default they are typeset on top of one another, making them unreadable. I would like them to stack vertically, which is the default behaviour of \marginpar. It doesn't matter that some of them will therefore not be rendered immediately adjacent to the line in which they were generated.

I need this to work both in math environments and non-math environments, so I can't use \marginpar itself. And I have this all over the place, so it has to be automatic like marginpar; I can't manually adjust the vertical spacing of each one.