With a monk not wearing armour and an assassin not wearing much I think this would definately be an interesting combo for bored folks... if it's possible that is.
A monk would be rather difficult (is it always is) early on but in being an assassin as well it would still have some bonuses that would save it. Later on of course you wouldn't need armou as much nor would you need as many weapons.
I'm just rambling of course and I'm missing lots of stuff that could be implemented for this but it's definately an odd idea.
Running around in the shadows (especially in multi-player) or invisi and then using quivering palm on someone just seems like fun to me!
Feel free to add or flame, it's just a suggestion