Blood Gulch, Lockout, and Hang 'em High are iconic symbols. Coagulation, Hemorrhage, Blackout, Tombstone, and High Noon just does not have the classic atmosphere of those. They do not need a remake. They need a direct port with the same layout, graphics style, tone, weapon placements etc.
Weapons you say are popular and just put it at that (Sandtrap, The Pit, Valhalla) Might be a welcome edition for remakes. But do not change the vehicle style there. Valhalla with mantises does not add up. Just resize/neaten up the map and make some eastereggs.