Not ALL signs are ASL signs initialized in SEE, but it is a trademark that ASL tries to eliminate.
SEE sign makes up signs too! What about DIET? (Non-dominant hand closed-5, palm out in front of the mouth, dominant hand D-shape, movement like EAT)
Don't do that! It's just opinion. If it helps someone learn, great! If it hinders language development, try something else.
as a side story: One of my teachers in my IPP (She was born profoundly deaf) first learned SEE. In her school, they would always sign CUT IT OUT to her. She didn't realize until she was 10 that CUT IT OUT in English meant "Stop it." That is where I see the problem. Misunderstandings like that can take years to resolve.
It's obviously not my system of choice, but if that's what's comfy for you, great! You are an adult and can make your language decision for yourself without feeling ashamed or offended.