How do I Change TTS Engine?

I am making a game in which i would like Text-To-Speech to read out some user inputted text.

This is going to be an Nw.Js game so will use the Windows TTS engine to execute this. However, Anna (Win 7 voice) is American and I need the voice to be English (the game is education and so the words need to be pronounced properly).

As far as i am aware there is no way to change windows voices which some pretty in-depth registry editing which I am not confident doing on a company computer.

To get around this I am wondering if there is a way for construct 2 to use another TTS engine (like E-speak)?

Thanks

All advice welcomed and appreciated.