Why the incessant want for flat courses? There are plenty of flat roads already, and plenty of IM courses have everything from rolling roads to mountains.
If you are that desperate for flat roads turn the trainer difficulty down to your hearts content.
On the Kona point, whilst I get it’s iconic, the course profile is pretty non descript… the thing that makes Kona is the conditions (wind, heat, humidity), the landscape etc… No one ever talks about the profile apart from that small climb at the turnaround to Hawi.
It just won’t translate well to the virtual world.
What they are better off doing IMHO is taking parts of iconic races like solar hill, timanfaya and trying to put that into Watopia or another world like they did with the Alpe & Ventoux…