I think you have to be rational than emotional at this venture. With the bad experiences in repairs of the Pajero you have to know quite well about consequences of a 40+ years vehicle. Those who used those cars did not have information like now 40+ years ago. 90% people they did not what is proper maintenance and top of it lanka did not have proper mechanics i assume. So cars are hacked to death. Most of them are now projects.
Considering your situation and budgets going for a maruti 800 is the best option by far. You can always bargain and come down on prices.
Reasons for a maruti 800 are
*it is one of the most reliable vehicles on the road,
*you cannot get that fuel efficiency in any 40+ years vehicle,
*spare parts are cheaper and lot cheaper, and spare parts are abundance
*Service and maintenance costs are insignificant
*you are a kid you whose studying and working you can't waste your time in garages
Go for a good condition maruti is my advice it ticks all your boxes when it comes to finances.
Study well and get a better condition better Pajero in near future.
Good Luck