I'm not sure what you mean. What do you mean by work? Is the game playable to a conclusion...almost certainly. That doesn't really seem to me to be a good standard. I imagine that if your looking to make a change to the game it is to improve it or at the very least customize it to fit your tastes. Obviously any change that fits you and your groups play is all to the good, but if your going to propse it tfor others to use then I think its imperitave that you have a good idea of the orginal unchanged systems intent as well as the intended outcome of your modification.
Talking about this mechanic specificly, why do you think its desirable to have more knowledge? The game already makes a LOT of vp knowlege public. In a mp game where you have s9ignificat ablilities to concentrate against a single player it is bad design to make all vp knowlege public.
The use of negative evidence helps to hid a players hunches in general. You CAN still make good deductions about other players hunches especially if you make use of the Snitch but if thats important to you then you have to expend effort.
It also messes with game balance. Some players have a bigger interest in the murder resolution evidnece system then others. By making that portion of the game simpler you are unbalancing the game towards those players.
One sytem you talked about does intrgue me is a way to interwave the turns a little more. I though about that myself before I got to play a few games. I have to say though that those 6 (or so) points tend to go quite fast once people become experieced with the game (and the dark cards really start flying). For now, on balance I think the complexity isn't really worth it .