Anything bitter tasting will actually do the trick since all you need to do is to stimulate the bitter receptors in order to stimulate the vagus nerve. 

Propolis tinctures though are extremely high in alcohol, and the propolis resin separates out when it hits the saliva causing the resin to stick to everything including your teeth.

With wine you have to deal with the alcohol and the lead levels. 

Of course Swedish Bitters have alcohol, camphor, berberine and stimulant laxatives. So each of the choices have their drawbacks. But the bitters would still be my choice as long as very small amounts are used. Again I recommend no more than a half a dropper full.