I do not agree with the opinions in the replies. And the opinions do not solve the addressed problem.

So, also with vanity addresses the privacy could be kept 100% as long as no outgoing transactions are

Personally i like the idea of vanity addresses very much and i will look into it how you can achieve the goal. I guess it will not be straight forward but should be possible.

Once u receive a payment you adress will change anyway.

I am looking for a way how marketeers or sellers could offer unique fancy adresses to receive payments.