Thought I would throw my hat into the reserve suggestion ring, with an African reserve in the country of Cameroon!
This reserve would be split between forest and savanna habitat mimicking the actual country with forest hunting in the south and savanna hunting in the north, with some species found in both areas, and others exclusive to one or the other. Obviously IRL the forest elephants are a drawcard to this country, but for reasons that have been gone over ad nauseum on this discord I am not including them. Olive baboon also not on the list as I am unsure if they would ever include a primate. Not included the huntable snakes for model/mechanics reasons.
Possible returning species:
Warthog
Lion (they do require a special separate hunting permit in Cameroon, but it is possible)
Possible new species, a non exhaustive list nor would all needed to be included, classes are a rough estimate based on average weights:
Class 9/10: Hippo (same situation as lion but are legal with special permit)
Class 9: Giant/Lord Derby Eland
Class 9: African Forest Buffalo
Class 8: Western Bongo
Class 8: Roan
Class 7 or 6: Giant Forest Hog
Class 6: Hartebeest or Giant Topi
Class 5: Spotted Hyena
Class 4 or 5: Bush Pig/Red River Hog
Class 4: Western Sitatunga
Class 4 or 3: Kob
Class 2: Civet
Class 2 (or even 1, blue duiker are tiny!): Blue Duiker (or another variety of duiker, there are quite a number huntable in Cameroon)
EDIT please see Moosedragon274's post just below for more species ideas!
Feel free to make your own suggestions, other animals, a weapon to go with the reserve, mission ideas etc... For example I can't find much info about any available huntable birds or things like rabbits.