I understand. It's funny how I have the exact same thoughts - get a tattoo and shave my head. I don't have any good suggestions - clearly it's good to do things that alleviate the dysphoria at least a little, but permanent changes like the tattoo should be well-considered. As for a tattoo I decided that this was the "wrong" reason for me to get another one, but I haven't put aside shaving my head yet. Hair grows back

. The thing is, I have a tiny head, so no hair will really emphasize that and probably make me feel worse.
Sorry, I'm rambling. Just wanted to say that I can relate!