The most interesting thing (to me) is trying to "limit" the debate* [...]
* which in itself is not a bad idea if it's about focussing on some aspect so it can dealt with properly.
I agree here. When I first started reading his proposal, it sounded like a good-faith effort to debate. I completely agree with focusing on one topic until a concession or impasse is reached, then (and only then) moving on to a new topic.
But no, I don't agree with trying to limit it to a specific mission. That serves only to artificially limit the domain of information that can be brought to the debate, which makes it not a fair debate. A claim fails if valid information exists
anywhere to refute it. Saying that exculpatory information can only come from some arbitrary domain in order to be valid is just a thinly-veiled attempt at muzzling your critics. Shame!