Lip sync with external audio after publish

I'm currently prototyping a scenario of exporting a character with various animations as movieclips to html5/js, and then making them say dynamically generated audio from something like elevenlabs from outside the canvas. I have the fla files of the characters, so can edit them, and have already been setup for lipsyncing.

In the exported code the audio file is referenced in 

lib.properties = {
	id: '',
	width: 800,
	height: 600,
	fps: 24,
	color: "#FFFFFF",
	opacity: 1.00,
	manifest: [
		{src:"sounds/audiowav.mp3", id:"audiowav"}
	]
};

And the idea would be that I want to swap that mp3, and rerun the viseme matching - or something.

What I want to achieve is a character, on a website, lipsyncing whatever mp3 you upload/provide to it.