Music Modding in AE?

[Live2sculpt]

The main menu 'music' is of ambient combat noises (rather than music) and it doesn't suit me. I would like to change it.

Music modding for Attila was once said to be very difficult due to CA not extending their Wwise licence. I have music modding experience with past titles but not Attila.

Other modders have evidently found workarounds since then. Age of Empires DOES include some music modding, but little is posted about how it was done.

Proceeding as I might with other TW titles, I converted the main menu music (from this mod) .wem file to .ogg in order to identify it. I then used Wwise to create a new .wem by the same name, from a .wav file of my preferred music, and used it to replace the AE menu 'music' in the pack file.

That didn't work however (crashed the game), and I'm not sure Wwise guide re Rome 2 music modding would be applicable here.

Is there anyone here who can tell me what I might have missed? Or should my approach have worked?