Emulating an imessage conversation

Dear everybody, I wonder if anyone knows how to do this?

There are a few apps that can emulate an iMessage conversation, some online but none do what i want.

As in any normal iMessage session, there are two parties.
my message appears on the right in blue, theirs appear on the left in green

I know how to send an iMessage using AppleScript.

I want to be able to send both sides of the conversation!
i would have a set of messages pre-prepared in the script.

the script should then
send msg 1 as user A,
pause
then msg 2 as user B,
pause
then msg 3 as user A,
and so on.

Or at least, it must APPEAR that is whats happening. I have not yet discovered how to pretend to be both senders. Of course, it may be impossible, but this is the place to ask!

I am confident that I can write the script, but I suspect that being any other sender but yourself is not possible…

Thanks for reading this.

Max