All of the OP's suggestions sounds reasonable to me, but may have to be adjusted if multiple/all of them are ever used.
If there is an internal balance problem with bows(and other ranged), I think that should be fixed. Xbows and throwers annoy me more. I think shield should be better against ranged and buff shield skill somehow so that it can be hybridized by 2h and polearm a bit better. All melee classes can use shields, so I don't think anything would get that unbalanced. I played a few months as 1h no shield and was almost better against ranged when sneaking around unless I was targeted with no cover compared to when I'm a shielder.