It would be nice to try with actual text inputs right on the page, that this doesn't exist is tiny flag.
A great choice to work with voice actors, because there isn't any 'pure' TTY that's good enough in the most general sense, having the actual voice actor as a working basis will help.
Perhaps for small game houses, they can just use something off the shelf, big houses can use a customized voice, and then not worry if they have to make tweaks or changes, they don't have to do a whole production.