Best way to impart rum flavor in caramel candies?
Your best bet is to use rum extract, especially one designed for candy making, and to add it only after the sugar (or honey) syrup comes to temperature.

The extract is going to have a much stronger flavor than actual rum.  You will not need to dilute your syrup base to get a good flavor.

Adding it at the end minimizes the amount of volatile flavor lost to evaporation.