You could check out a Charvel San Dimas. The HM neck profile is allegedly similar to the San Dimas. It has a compound radius, but theoretically it should feel similar. Only 22 frets, though. Charvel San Dimas
"Jimi would be playing an HM Strat if he were still alive." Bob @ Genesis Recording Studios.
Ibanez Prestige necks have a 17" radius fretboard on most models (usually listed as 430 mm... or 16.929 inches). Sometimes it's difficult to wade through the many different Ibanez models with similar or the same names and model numbers but with different specs, but with a little work you CAN find an Ibanez which was made in Japan, has a Prestige 5-piece maple neck with a 24-fret ebony fretboard, Dimarzio pickups (in some models, like the J-Custom), and an Edge/Edge Pro/Edge Lo-Pro bridge (and not an Edge Zero, Edge II, or Edge III bridge).
I've noticed that Some of the Music Man Petrucci signature guitars have interesting fretboard radii. If memory serves, the JP-6 has a 15" radius, the JP-X has a 20" radius, and the JP-XIII has a 17" radius. These are very nice, and one of the few guitars Music Man makes which has 24 frets. This is the guitar I was going to get until by chance I came across an HM Ultra one day.