Should the complete voiceover prove to be impossible (for obvious reasons), I urge the Larian team to not give up completely on adding "voices" to the player characters in some shape or form, regardless of how limited they'd have to be. Because nothing makes the characters come to life more, than a real spoken sound...

Remember the Diablo 1's "The sanctity of this place has been fouled..." and other short, rare yet immersive monologues uttered by the character upon entry to new areas? How much spine chilling immersion it brought to that limited and archaic game, and how much more alive those few spoken words made the character feel...yet hov little resources it took to achieve.

All I'm saying, is that there is a creative solution to any problem, one just has to look for it, knowing that it's really worth the trouble...and regarding the voices in such an immersive game as D:OS2...
-- it is.