Notepad++, replace "x" with a value from a list

Basically what the title says, let me make an example.

this=X
that=XXX
those=XX

I want to randomly replace X with a value from a list for example, (1, 2 or 3), so that it becomes:

this=2
that=312
those=32

Note that I would prefer that there are no repetitions in the strings, although I can repair that later, if necessary.