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This word "substantiate" seems like a brand new scapegoat to avoid debate. That's okay I won't bother. It seems you won't be happy unless someone writes their own totally sourced novel and puts it in for peer review just to prove a point.
I don't know how "substantiated" and "credible" you can get with people leaving the IPCC. They leave the IPCC and do interviews and the answers and opinions are posted in blogs. You can't get more than that, the only thing further I've seen was that twitter post from the guy himself about the 97% survey or youtube/news videos of the people speaking themselves.
All the graphs have a source, most of them come from the IPCC and the "peer reviewed" papers they use, same with the IPCC and same with any graph bloggers use, they use data collected from either papers or straight up data recordings.
Lastly are you saying we have to have oceanographer PHDs to show a graph about ocean temperature cooling with data collected by an oceanographer.....? What about Ice Core data, do we have to go collect it ourselves? Am I not credible and qualified to read lines on a graph?
I think you miss the point of what a discussion and what a debate is. It's not about who has the most certificates. Usually people start with what would be accepted examples and evidence. (ie debate guidelines) In this case all we can use is opinions and papers by scientists, data collected by scientists, blogs including interviews with scientists and good old fashion logic. If you want no part of it that's fine I'll stick to engaging people that have a thirst for logical discussion and rational debate. You won't find what you're looking for here that's for sure, but good luck.