headinhands what we have in John 8.2-12 is not a doctrinal statement about whether stoning is right or wrong. Jesus says nothing about it.
What we have is a story about how he stopped one stoning. I have to say that I think Jesus's strategy is far more effective than yours -- in all of my experience of being in situations of conflict I have never found that saying 'you are all wrong so you should stop now' is very effective.
(Unless, of course, you are a policeman, in which case you are enforcing the law and they are breaking it, which isn't what's going on in this case, or unless you are threatening them, which puts you in the same moral position as them -- punishing someone by force for something you don't agree with.)
What Jesus does is to challenge them -- by asking what right are they judging and punishing her. And he's very effective. He stops it right there, and they go away and leave her alone.
One thing we do know is that Jesus doesn't think we it's right to have sex with whomever we wish. He condemns adultery in the frankest terms, and, I have to say, I'm with him there. Even if you only had the Relationships board of MN to go by, it would be unarguable that adultery causes pain and suffering, breaks relationships and hurts children.
But he doesn't say, yeah, go on, throw rocks at her. He says, which of you are so good that you have the right to judge her, and stops it. Our principles are what we live by, what we actually do, not just what we say. On the only occasion we know about that he witnessed a threatened stoning, Jesus stopped it. On the available evidence, then, we know definitely that Jesus thought that adultery is wrong, and that the best strategy is not a violent punishment but repentance and forgiveness. On the basis of what he did, we can say that he opposed stoning.
I don't see, in that case, how your position is superior to his.