User blog comment:Aandrew07/What Portable 3rd should have been/@comment-3298463-20110117111857

Frontier could be considered as a second gen game. The monsters, maps, hitbox and engine are all the same. To make Frontier monsters fit in P3rd, they would have had to revamp them, like they did to Rathalos, Rathian and Diablos in Tri. I doubt they would take that much effort.

Then there's the whole "Frontier is owned by Django" thing, which makes your wishes a little impossible.