You can buy a small block of polymer clay at a craft shop for under $3 and make dozens of lightweight scalpel/Exacto blade handles. (Fimo is the first one to come to mind, but there are others.)

Just cut off a 1/4x1/4x1/2" piece, knead until soft while you're preheating your kitchen oven to 265°F or whatever the clay recommends. Roll it into a snake twice as long as you need, press the end of the blade into one end, then fold the other end over the end of the blade to sandwich it between the clay, leaving it about 1/8" thick. Shape or trim to suit. Bake for 10-15 minutes. Let cool.

Make sure the clay oozes through the hole in the handle end of the blade so it's secure within the clay.

Do NOT use a higher temp than the package of clay recommends!

Sue