Is there are way to change the texture splat files realtime

Is there a way to change the texture splat files real time and re-matrialize the hightmap say you move from one aera to the next can you rather then loading a new map just change the texture files accocated with that map
Say im using
SplatFilename0=vortex_ground.png
SplatFilename1=splatting_grass.png
SplatFilename2=splatting_rock.png
SplatFilename3=splatting_snow.png

and when i get close to the beach change the splatFileName0=splatting_sand.png
and have it be sand by the time the cammera reaches the beach?

It's not actually possible.
You have to use one material per page. (using Image texture mode)