After seeing the voting results I would say "do not believe anything you read in a post". "Cunning" is tied for first place. The ones who voted for this will not be afraid to lie to get what they want. The second place voting is for "confident". These players are also confident they can pull this off

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But seriously, you should make the game YOU want to make. That will turn out for the best. You have to want to make this game very badly, and do that the way YOU want to, or it will likely fail. Trying to make a game to please every player never ends well. Do not make too many paths, and make those you want to see yourself.
At this point, I will compare this to Karlsson's Gambit which I consider one of the most intelligent games out there. Even if it mainly focuses on femdom which I have NO interest in. You CAN play a Male Dom path IF you are the smartest person in the room. I believe that an approach like that, would work well in this game. If the MC is working with British Intelligence, he is obviously no idiot, or they would ignore him entirely. That already sets him on the path of being somewhat calculating (first hand experience). If Emily is the super spy you describe, she is also going to want to deal with someone intelligent. Anyone as accomplished as her is going to see through your deception immediately if you go down that path.
These are just my feelings about making this story idea believable to the player.
My final comment is some of the renders you give as examples are VERY dark and it is nearly impossible to see what is going on.
A little more work with lighting would help a lot.