Anything is possible but it would not be cost effective to replace the V6 with a diesel - sell the car and buy a diesel.
As far as tyres go - I would have to say I do not have a problem - originally my car had Bridgestone HTs and I got about 50,000 km from them. I currently have BFGs that have done 25,000km and wear is neglible at this stage.
The rear drive train can be removed - but what is the point.
Wear problems can result from a failed viscous coupling which will cause axle windup which on hard surfaces can only be relieved by the slipping in the tarmac. Get the VC checked. Other issues with tyre wear are the standard things such as wheel alignment (front and rear), tyre pressures or damaged suspension.
Garry
Freelander XEDI
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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