This is getting ridiculous. You guys simply are not thinking one step ahead, exactly the same sort of stupid shit that cost us Chapter 6. It would be too big of a concession for the Concordiat,
Baltika9, even though the idea sounds nice. Zhang already said that he would try other things if we refuse him or offer him a bad deal, and he'll do exactly that if we ask for gunpowder tech. Remember that he has other avenues of doing things if we refuse a deal or if he finds our deal unsuitable.
The only way I could see something like this working is with a concession of our own, Even then, it seems unlikely:
Scholars have begun experimenting with steam power, and a working prototype of a steam-powered water pump is currently being tested in the northern mines.
Considering how unstable the north is at the moment, I'm not sure how feasible this would be. If one of the rebel Emperors like Jannik Inge control the mines in the north, then delivering this prototype to the Concordiat would be unlikely.
I'd have thought the Watchers would follow, really, unless we explicitly schemed to lock them out (which would get their panties in a knot).
I'm happy with either of our A3s (and I am pleased to have inaugurated the dynastic naming scheme), but i just think entering the labyrinth has a clear benefit of knowledge (I doubt it would be a red herring of totally useless knowledge for us), while the marriage risks being a long term thing with zero payoff. If we send the soldier off to Tamur, we won't have him around to protect us and do stuff; if the princess comes here, then our leverage and influence on the Tamur court is diminished.
But that's my point, if you're so concerned with finding out Zhang's motivations in the Labyrinth, then interrogate him (C) or tell him you're unwilling to bargain with him under his terms and send the Watchers to figure out what he's after (B). Or do as I suggested and arrange a marriage between our friend and a Tamurian princess so we can infiltrate the area more easily and find out what he wanted in the Labyrinth afterward. Even if we bring the princess here and our influence is reduced, we can still send a Watcher or two under the pretense of diplomacy.
Also, t's not about whether it would be pointless knowledge in the Labyrinth or not, of course it's important - it's whether we'll be able to actually come out on top if we're in there. Considering it's a Labyrinth that is probably full of undead (I believe my speculation here is reasonable), and that Zhang seems rather untrustworthy guy to be guiding us within the Labyrinth, I don't like our odds inside a place like the Labyrinth with only two Watchers in the vicinity and little in the way of fighting abilities ourselves. This guy is not Ean, and you should stop thinking like Ean. I mean, I guess we could make it and telepathy would at least allow us to figure out if he's lying or telling the truth to us about certain things, but this is really not Dio's natural environment and we really ought to be avoiding combat
Could we not stall Zhang in some way? Yes, he's stated that he has ways of getting inside the Labyrinth, but we really ought to have our soldier buddy with us. I'd prefer to get word to him, then explore the Labyrinth with our friend to deal with any physical threats, and Dio to use his telepathy to deal with any possible subterfuge from Zhang. However, this might understandably take too long.
treave, is our friend in Ankida - would it take long to get word to him and bring him back to Crete?
In any case, I think that diplomacy with the aim of figuring out his intentions in the future is the most realistic option we have. I'm sticking with my vote.