I'm really struggling to understand what are you trying to say here. Put reprisal effect on Intervene/Circle of Scorn or similar? If that is what you mean, then no, putting MIT on skill which is part of your rotation makes no sense.
But anyways, reprisal is better than having no reprisal, I really don't think that tanks having some 5 self mits and 2.5 group mits is far fetched, could honestly be more. You could consolidate it with Divine Veil and others, but meh, that's lame, just keep it as it is. If it was on one button, you would use it less frequently and kill the creativity. Divine Veil is at 90s, Reprisal at 60s, so you can use them both at the same time, or space them out and similar. They are better designed than regular damaging oGCDs, because they are pro active, and not just some part of you rotation that you use on CD.
So offtank should just stay in one of the front corners, so he doesn't take aggro from wall boss? And no, Provoke won't help it. Provoke merely places you on top of enmity list and gives you a little extra enmity. If tank stance was a trait, and OT had better gear, he will keep overtaking aggro before MT's provoke even cools down. You're really overcomplicating things with this.
As I pointed out before, this has serious pitfalls. In the end, it's computer which decides whether you will use dash or not, and this barely ever ends well. Player will not always agree with computer, and 99% reliability is just not enough for these things. Just like in the example I gave you with the max melee situation, where your small misstep makes computer decide that you will dash, which will get you killed. Sprinkle in some terrible netcode and you have a recipe for disaster. Just like with tank stance, you're overcomplicating the most simple of things.
