Thank you for your reply, Ferdinand.
I had a similar timer workaround in mind when I decided that there must be a better, official way to do this.
Will implement it this way now, running every 3-4 seconds should be enough.

Hi all, is there a callback or MessageData ID that my Python plugin can attach to detect new projects? I would like to execute some code every time a user executes File > New Project.
Thanks! Michael