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I get the thrill of the uke enacting revenge but really, what will that accomplish at this point? they already like each other, maybe not on the same wavelength, but still there's mutual understanding there.
So let's say uke kills the seme, then he kills himself and then what? they'll just end up being fertilizers and nothing more. Uke's loved ones are already dead and seme isn't going on a killing spree offing noble houses left and right as he please, he's actually following orders, he's not Seungho from POTN, the seme himself is just a puppet to the royals, so if he dies, the brutality will not cease, he just gets replaced like the rest of 'em (specially now when 2 strong figureheads against the monarchy are already dead). Plus uke is already being tortured on his own because of his shifting feelings.
The only way for uke to actually hurt seme is to outwardly reject his affection in a "push n pull way"- if he can play mind games with him, to use everything that seme likes about him against him, so say if it's his sexuality, he might go on a rampage and sleep with a bunch of other dudes, that will really get to the seme's nerves, to make him crave him even more and be maddingly obsessed about him, and since he won't kill uke, it'll fester even worse until he eventually do kill him himself (plus if he kills too much of the other dudes that's another strike on his already fragile social standing). Seme will surely regret killing uke with his own hands, which will haunt him for the rest of his life -- that kind of revenge I believe is a fate worse than death rather just straight up offing each other--what is this a stage play?
But then that plot would be out of character for the uke since his profile is proud and prudish, in any case if he really just want to off seme, he could just try it and then off himself regardless if the seme lives or not, does it matter whether it's successful? he did the assassination like intended anyway (it will also reduce collateral damage), and since the seme likes him already, him offing himself while the seme lives on will surely cause great emotional damage to seme too, might even lose his mind, who knows? that's a much better revenge.
Of course, these are all just my takes on this so far. I see death as a peaceful escape, it's the method of how one reached it that gives it sting. If the uke succeeded in this plotpoint of offing seme by poisoning him and then stabbing each other, it's just so theatrical for me really, I don't care much for it, he basically just gave seme slumber as means of death, when it should be far worse considering uke's drives and motives. Now, if he did poison seme and he suffered illness that gets worse as time moves on, that's another good revenge because the seme actually suffers for it and he is unknowingly at the mercy of uke during those times. Otherwise, just let them kiss kiss fall in love LMAO