
It's not that easy to turn a non-royal into a royal, Sihan was really lucky because most people die in mid-process, right?

Yes, but if Lucaon is desperate enough and Kyon is dying anyway, there isn't really anything to lose. Plus, Ryan and Cecillia are around and they are authorities among the royals. I'm sure they'd be able to help. We also know Ryan would probably help if Lucaon asked.
And, of course, Kyon has main character armour anyway :P If he dies, the story would end. So, I still say it's possible for them to try and turn him. I want November to hurry up and come so we can find out.
I just thought, what if Lucaon turns Kyon into a royal in order to save him from himself and Edwin? I don't think royals can control other royals and Kyon seems to be set on dying to protect Lucaon, so maybe that will be the outcome. The title would take on a new meeting then, assuming Kyon stays a servant.