Well first i flew to Dubai to load a container full of clips beds roofs and rear panels. Assembly was extremely difficult and required tons of tricky spot weld removing. Its been about a year In planning and execution.
So i take it your not interested in owning this but heres a screen shot of PartSouq for chassis code FZJ75LP-MRUV which clearly has a disc brake option in the lower. Even if it was a conversion i would say its for the better. However I seriously doubt it it.