If you genuinely believe that the dom paths are the only "canon" endings, the only artificial construct here is your over-inflated ego...
Seriously though, even assuming Tess will pick a "canon ending", and not leave several factors up for interpretation for any potential sequel, (eg do what every single Elder Scrolls game does when it has to deal with multiple endings) you are going out on a massive limb if you assume the cannon ending will be one with a dominant Kane. Even if the "cannon ending" is one where Kane and Olivia worked together and "eliminate all other contenders", it could easily be that the sequel will never reference the kind of relationship they had, OR will explicitly go with one in which Kane submitted and served under Olivia, who was the one who actually eliminated the contenders. (far more likely in my opinion than her going with a dom Kane canon, given that she herself is a dominant woman and she's put Olivia in a far more priviledged position than Kane within the organisation...)
I'm not actually saying Tess will canonize a Kane sub path - I do not have the same kind of hubris you do in order to call what I'm not into fake or "an artificial construct" with no evidence whatsoever, but there are far more paths where Kane is a "pathetic worm that kisses heels" than ones where he gets anywhere close to the level of power you fantasize about. Plus that Veronica has already shown that she can outsmart Alexander, so who's to say Olivia, Alessandra or any of the other sisters won't too? Also:
Has it ever occured to you it might be that nobody will fulfill the deranged old geezer's sexist prophecy? Especially with Tess herself being a dominant woman? And that the Empire will have a strong-willed, intelligent and powerful Mistress, not master, winning the gambit, to Alexander's, and apparently very much your, chagrin?
The dom content can be just as fan servicy as the sub routes and, again, just as I said before, Tess is God in her own narrative universe, so as long as she doesn't hint your dom Kane gigachad fantasy is gonna be the cannon ending, then it simply isn't. It will be just one ending out of many, no more nor less valid than any k1 ending with a mutilated to death Kane by Dr. Chastain, Juliette and Samantha, no matter how much this pisses you off...