Note: This is a question-with-answer in order to document a technique that others might find useful, and in order to perhaps become aware of others’
What if you create a small VBScript with the message you want to display? I.e. create e file, named "Message.vbs" with the content:
MsgBox "Some info here", 0, "Message Title"
and call it like this:
cscript.exe PATH\Message.vbs