In think a 223AI is imminently doable, and may be worth whatever troubles might/could be associated.
I went through this very quandary about a decade ago, when I had determined that the 22-250 ran too hot for match COFs. The 1:8" 22-250 shooting 75's has been a dream that faded for a lot of us.
I opted against the AI on general principle. The AI concept takes a popular and perfectly functional chambering and gives it a taste of steroids. Left at that, fine. But the very idea of hopping up the original round can also lead to hotloading the AI. This form of abuse takes the bore to intolerable temps, just like the 22-250. I see it as a net no gain. It should work, and would work, were it not for the natural (unnatural?) tendency to beg for more; this being the qualifying trait of its proponents. IMHO; nice but inevitably doomed by human nature.
I stay with the 223, and recognize that it has its limitations. I accept them. I branched out to the 6.5G but the projects have been stalled by lockdowns and harsh heat. The 308 is the 223's F T/R big Brother, and when that's not enough, there's the F Open 260/6.5CM. KISS! The .264 100gr ELD is a wunder-bullet at 4350ft altitude (840-860 MBAR), IMHO.
Greg