Would USA guides and outfitters in" general " be in support of the type of hunting we are discussing if it were to be suggested that it be conducted in the USA or Canada for that matter ? .................
Canada is broken down into provinces, as is RSA. Each province has different laws relating to hunting.
In Alberta, you can hunt "wild boar", goats, and bison inside a fence.
(The goats are the four horned variety and the boar are not indigenous.)
You can not hunt ANY game species inside an enclosure at all. ZERO.
Next province over you can hunt deer and Elk in an enclosure. Totally legally.
The Elk are transported, traded and moved as desired. Hunted in various size camps. Same issues as RSA. 160 acres paddock to whatever size. (Note Saskatchewan does not have any mountains.)
Quebec has some enclosed Red Deer hunting. I think they might have some Elk too.
Generally, being the second largest country on the planet we are blessed with very few people relatively and a LOT of space. (Although at times it does not feel like it)
Texas has got to be the home of high fenced hunting in North America. You can hunt Bongo in Texas.
Damned if I know how it is done. If I am ever lucky enough mine will be hiding in Africa for me to find.
So, we are all over the map here in North America on the subject. Some for some against.
Some see the Elk as wild and free and others see them as livestock.