I'm not sure if this is something that's been proposed before, but as someone who plays primarily Japanese ships, the extremely American accent of the announcer bothers me to no end. I've personally solved this problem by downloading the audio files from the Asian client, with Japanese Audio enabled, and placing them into my res_mods folder. However, this forces me to re-download the (Asian) client every time there's a major update introducing new ships or sounds. It would be far more convenient for me, and probably a nice option for others, if you could introduce these voices to the larger modpack and update accordingly.
I have the files available if you want them, but I'm sure you could download them yourself if need be.
Thanks,
-Flamefang