Though Rover may have discontinued the 3-door Range Rover for the UK market in 1981, the company had continued to build 3-door Range Rovers for select markers within Continental Europe for another decade.

Linked below are a couple newer 3-door Range Rovers that were built for select markets in Continental Europe that have been personally imported into the United States:

https://bringatrailer.com/2017/08/11/no-reserve-turbodiesel5-speed-1991-range-rover-two-door/

https://bringatrailer.com/2015/12/22/sharp-two-door-1986-range-rover-diesel/