Hi
I read your post carefully. I got your requirement. It will be better if you share example company website.
To do registry and wish list I have to use third party website data store facility. Shoify has no facility like this. I can make this project successfully possible.
I am professional shopify expert. I have skill on shopify administration, Liquid programming, Third party facility integration, Jquery, HMTL, CSS.
Call me to discus in details.
Thanks for the time.