Would it be wrong to have berni wrightson sign this copy? I know he didn't work on it but, it is an awesome cover for sure.
Why do you want a Wrightson signature on it?
Because its an awesome cover, I love batman and wrightson created swamp thing. To me he can sign any swamp thing book out there. Look at all the Stan Lee books out there that he never even worked on the title that he has signed. To me that is wrong. Wrightson created it, he can sign any of it.
You are right...I've oversaw that Wrightson created Swamp Thing. Lack of knowledge so...it depends on the collector. I think If I had the chance to get Bob Kane signed my Batman books, which he never worked on, I would choose only my favorites and not every single book.
So in your case, I would do it and try to get a Wrightson on this on. I was lucky enough and had the chance to meet Wrightson in London and to get my Batman #320 signed. I love he signature style.