Very Pretty! The good news is that an R will be more stable than an S. You could make it from gumpaste lying down with a long skewer all the way into the backbone of the R and a small skewer into the toe (both sticking out of the base for insertion into the cake). Make sure that the 2 skewers are parallel to each other or it can split your letter when you try to put them into the cake. You would make the gumpaste flowers separately and then attach them to the letter. You could make them on wires before making the letter and then insert the wires while the R is still soft or just adhere them with royal or chocolate.