Adding a few custom spawns from Askara to less desired places on the rl map is the way to go IMO. Eg. Eyelords to Ab'dendriel and Carlin, Elementals to Edron, fenrock north of Thais, Venomir to Safe Port, etc...
You should also look at the loot drop rates of the few specific monsters, buffing or nerfing them. What I mean is, most of the custom monsters always brought profit, like Venoms (ok, don't mind this as they can easily one-shot you), also Eyelords, Freeze Heroes, Terrible Nightmares, Bonedemons and Elementals, most of these places were easy to hunt while always bring consistent profit, even on mages, while places and monsters that were always popular in 8.0 like Frost Dragons, Hydras and Dragon Lords (probably forgetting few others) were garbage and almost always empty, Okolnir empty looked wierd.
Point being you should slightly tune down some of the custom monsters drops, while slightly increasing drops of less popular monsters, but instead of increasing rares you could just increase gold/sapphires/diamonds/etc, so if you would usually loot between 14-16k of this garbage per 100 kills on these monsters, now you would loot between 21-23k, so it saves you around 7-8 bps of mana, nothing major but something to give people some hunting variety.
If you are not going to add Prison, Asuras, and these op places you should make bonsuses for team hunting a bit better, like 5%-15%-30%(or 35) because I haven't seen a single 4 man, different vocation, team hunting on askara. But if you are going to add these op places, then keep bonsues as they were on Askara.
The whole point of this is to make more balanaced places for exping, cuz on askara if you were not exping on X places after 120, you better just stay in depot, so insted of havig 5 broken and op places and rest being shit, have like 2-3 broken places for exp/cash and like 10-15 balanced places with steady exp and profit/loot.
Also, an interesting idea would be to add another war guild bonus, which most of the war guild would prefer, which would be slighlty increased loot rate (15-30%).