When adding Gurkhas to the ORBAT, it would be useful to remember that they are a finite resource. According to my incomplete research, during the 1990s, the following armies had this sort of number of Gurkhas:
UK: c5000
India: c50000
Nepal: c 5000
That's 60000 troops from an ethnic population of 3,500,000 at best. Whilst there is great competition for places in the British Army, about 60 applicants for every position, the supply might run out if there was a massive recruitment drive, even assuming that all 60 applicants were suitable anyway.
Several battalions, maybe even a division's worth of troops, would be possible maybe but after that the recruitment might start dropping off, especially if India was increasing its forces too.
As for finding manpower for other regiments, the UK has a quota of troops from overseas used to fill its ranks. This is about 10%, if this was waived in the early Nineties and the UK had a sort of "Squaddy Windrush", you might find the manpower from the Caribbean, Fiji and several African nations. Again, there are limits to how many would join but it could fill the ranks.
If you went this route, you'd need to skew UK character creation somewhat as between 10 and 20 per cent (maybe more) would have a more exotic background language than a Celtic Fringe one. Other issues could arise depending on where these foreign troops were stationed. In Europe they might be classed as mercenaries by the Soviets and treated badly. In Africa, it might lead to more desertions when the war ground down as African born troops could decide to go home and look after their families.
Elsewhere, foreign troops could be among the most loyal as their unit would be the only home they had left.
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