FitzTheRuke
Legend
You could make them enhance existing healing effects.
Alchemical band-aid: When taking a short rest you may re-roll up to half (minimum 1) of the expended hit dice. You may take either result.
If you care, this is technically a D&Dism. Historical bucklers took a hand to use, but were more portable than a big shield.
I know that one can't always trust reenactment for historical accuracy, but I once saw a row of archers fire their bows and then cover themselves against returned fire with their bucklers. It was enough to make it believable to me that such a thing could be done.
It's also my experience (25 years of martial arts unrelated to the afore-mentioned reenactment) that the difficulties and drawbacks of various weapons and techniques are so different from what people imagine, that any inaccuracies that something like allowing a buckler to work with a bow might add to the game - would pale compared to the inaccuracies that already exist.
If that makes any sense.