Ah yes. This would go nicely with my slightly with my slow learner deterrent programme. Overall this suggestion is the best one i've seen of this kind in a while that hits the nail on the head for bringing outsiders into dwarven society.
Breed some troggs in captivity, with a childless/AND-OR/suitable foster parent in the fortress
This is Martha/Marcus McGorescream
Yadda yadda yadda... She/he dreams of raising a family, she/he likes troglodytes for their grunts. She/he would be willing to adopt a child for her/his own, she/he would never give up her/his children, like others in her/his culture she/he doesn't approve of giving up children etc etc.
Proceed to smash the trogg parent's skulls in outside of the line of sight (word to the wise, trogg children exploitably try to path directly out of the map on birth so recapture should be easy) and ensure one trogg leaves as to not deplete the cavern populace (unless its infested) but still instill fear rather than aggression so your dwarves can forage without being bothered. This is a brutal but effective way of killing two bird(men/women) with one very heavy stone.
Question - Would slow learner/intelligent adoptions be immediately upgraded to citizens or remain as pets until adulthood? Since a trogg is the size of a dwarf they'd make excellent frontline troops/part time builders/cavern guards and have armour that fits by default by size on top of naturally high strength and innate climbing ability despite being very hard to train weapons/fighting without skilled handlers & poor sunlight resistance
A few faults i could see is that dwarves might go out into danger to 'rescue' their newly adopted children or become extremely upset when under circumstances the brand new child dies walking into a trap/pit of animals it just turned away allegiance to. All manner of FUN.
There is also divisionary issues about neutral or good creatures adopting evil creatures which may cause multiple conflicts with laws, such as adopting a baby troll which will grow up to be a ill tempred and destructive creature that'll go around breaking workshops because it cannot find any ale or stubbed its toes on a rocky crag and will probably be a victim of the justice system in the future if it doesn't go on a rampage and be put down by over-compensating guards first.
Though i will admit, ogres make EXCELLENT tavern keepers from experiences with modding, so i know what to adopt as a priority.