I would like them to still focus on doing what they do best working with ultra rare small species which they excel at
Yes, I think so too and I would be very disappointed if they departed from this focus.
Some of the species I included in my new updated list above sort of reflect on this and take into account Jersey's transferrable experience that could be applied from this and keeping within focal regions.
Buffy tufted marmost and white footed tamarin - Jersey has a lot of experience if not the most experience with callitrichids ex-situ and Colombia and Brazil are historic focal areas.
Ricord's iguana - Jersey has a lot of experience in breeding iguanas and particularly those from the West Indies like Lesser Antillean iguana and rhinoceros iguana and have historically and to this day worked heavily in Hispaniola.
Black blue eyed / Sclater's lemur and mongoose lemur - Jersey has a lot of experience in breeding lemurs and have historically and to this day worked heavily in Madagascar.
Brazilian merganser - Jersey has a lot of experience in waterfowl husbandry and conservation and have brought several species back from the brink.
Ridgway's hawk - Jersey has a lot of experience in breeding endangered birds of prey like the Mauritius kestrel and brought the species back from the brink so there is transferable husbandry experience which could be applied to the Ridgway's hawk and the trust have historically worked heavily in Hispaniola / Dominican Republic.
Hispaniolan hutia - Jersey historically excelled in breeding the Jamaican hutia and gained a lot of experience in the husbandry of these rodents and have historically and to this day worked heavily in Hispaniola.
Some from the new list would admittedly be wild cards like solenodon and golden lancehead viper but I highly doubt that they would struggle to keep or breed them in captivity, quite the opposite actually.