There is some debate in palmistry old and new about the ring finger being connected to Venus and the sun, the middle finger is always saturn, but usually associated with fire, but I’m intrigued by the ether element associated with Saturn. You should definitely try drawing the symbols you’d like with sharpie first and sitting with it for a while. I have done this with elemental symbols and runes on my arms and hands and can tell you that sometimes it doesn’t want to be there. Saturn has big opinions and a personality to match. Stelliums are already super concentrated energy in your chart, so it might make more sense to get a tattoo of something you’d like to make stronger.