I have two comments to make.
First, I think it is very difficult to assign a value to a medal. Ordinarily, in the course of a person's military career, they will receive first a long service medal, at the end of 12 years, and they will take part in other campaigns. The number of medals a person will receive in the course of their career may range from 1 to 10, for example. Separately, they have a particular value, but the total value of a person's collection will be different. So it isn't that simple.
Second, you are only talking about informing the recipient at the time the medal is presented. The bill proposed also deals with medals given to family members, for example. At what point are we going to start giving instructions to everyone: the father, the mother, the son? We have no idea who the medals will be given to later.