There are so many already established and proven alternatives, that it wouldn't be worth the time or trouble. There was brief time when a few people tried the old 2.5 Iron Duke Chevy engine. Those boat anchors get tossed in favor of Tdi engines.
A friend of mine runs a land rover / range rover specialty repair shop. Based on his experience, they are capable of stopping anywhere, anytime, at any cost.
I don't know about the brakes, only their unreliability.