It can be difficult to discuss hammers without photos to be sure of what you are talking about. I personally have forgotten what most of my hammers are called since I have purchased them all so long ago now. One thing I did was to purchase a lot of a German made raising hammer from Tevel at Allcraft (Google it in New York area) and then modify one to my needs when ever the occasion arises. I know you said this is difficult right now, but you should try to find a way because other than peening hammers, almost every hammer you buy will need to be refaced to your needs and polished. Maybe if your local high school has a shop you can trade mentoring time for use of their equipment.