While this isn't necessarily a terrible idea in the end it would not change anything. Because SGMs do double check the evidence and do make sure that the ban was warranted. Having a sort of middleman do this will just prolong the process without any change. Since if the evidence isn't strong enough and makes a SGM question if the ban was actually warranted they won't just shut said person down, you do not need a middleman for this.
Zenor touched upon this already but I want to add that if someone does get banned for RMT, and they get said message like "Your account has been permanently closed due to breaking the code of conduct by trading in game assets for real money." it is 99.9% also actually the case.
The fault of the current system is that false positives, which do happen occasionally, are very hard to spot. Because I have seen it happen where the stars align so much that someone got banned because of it. Is this ultimately the fault of the system? Yes. But if staff sees the evidence and case of the false positive, and if the evidence looks like hard evidence but actually just very unfortunate timing, everyone in staff would agree with the ban. Therefore the false positive will get the same message as someone who actually did it because the persons who are in charge of ban appeals see no reason to look into it further which is what makes it sometimes feel as if the system is unfair or in other words complete dogshit. But these are oddballs, very very very rare cases.
And to be honest this is a really hard thing to fix, because being framed or being falsely accused of something in real life also happens.
You're right, it doesn't hold up. But it's not an excuse. It's a factual thing. Everyone has always complained for the longest time that ban appeals take way too long to be handled. If staff were to also write out unique answers for every single ban appeal they would be handled even slower. It is very unfortunate if someone gets banned, I would never want to see anyone get banned. But the fact of the matter is, if you got banned and the evidence is there to backup everything a GM did to ban a person. Why would anyone in staff give them more time and effort than they do right now? And as I said before if something isn't clear, they do actually get asked their side of the story.
Also I would like to add that someone saying "I didn't do it" doesn't mean they actually didn't do it. I have seen plenty of people that I trust say to my face I didn't do it, but then they actually did it.
Last but not least do I think the current way ban appeals are handled could be improved? Of course, there is always room for improvement. But I think how everything is handled right now is pretty much how it's going to be for a very long time in the future. Would it give players a sense of closure if they saw and got explained more what they got banned for? Yes and should that be the case? In an ideal world yes. But the day only has 24hrs. I am not quite sure any of you understand how much time and effort ban appeals already take. Trust me I wouldn't want to deal with that stuff even if I got paid to do that. In the end there are some cases that get screwed over by the current system and that should be improved. But the way they are being responded to is essentially the way it is.