I've converted that heightmap and named it after you Here's the download along with other heightmaps:
Do note that I didnt removed the imperfections!
Also, I didnt used 243 biomes, I've decreased the colours to 10 so each heightmap has 10 biomes which should be enough I think
For really detailed and huge mountain ranges I might use 20 tho, but as I'm currently using only 6 biomes for mountains I think it's pretty unlikely.
@oldTCcreator Check that link out, you might find some nice heightmaps for your testworld
Here's a example of the used metod:
I do have more advanced ones but I didnt included them into the download: