Nice idea..but will never happen unfortunately. The Himalayan precinct idea is really great and creative but don't think it will happen unfortunately, Snow Leopards, Red Panda and very inbred Himalayan Tahr are our token Himalayan species and have a feeling it will likely remain that way, would be nice to see some Pallas Cats again like Adelaide once had and would be great to see Takins etc but think it's likely never going to happen sadly unless one of us became a multi millionaire.
With Bears think Sun Bears should always remain our primary Bear species, closest Bear in proximity to Australia, the perpetual SE Asian theme most Aus zoos promote, rescue stories. If we're lucky we might see East Asian Black Bears and return of some Syrian Brown Bears someday. Would love to see Sloth Bears and Andean Bears but very difficult and sadly unlikely which sucks heaps.
Re:Wildebeest even if there was a cure or vaccine for said disease, knowing Australian government they'd still keep the ban in place (they're extremely strict) getting suidae into Australia now is like getting snakes into NZ.
I don't know if Peccary can have their sperm imported but it the makes are casfrated at Melbourne maybe try artificially inseminate the female with thawed out frozen sperm from a male Peccary from overseas (don't think ZooVic would want to pay for such an undertaking though) best we can do is cherish our last 3 Peccaries at MZ (cool that it sniffed your hand and they were in a letting pen capacity at Werribee in the '90s).