From how I read it, the gist of what the OP wants is a queued arena game (like Fortnite or Call of Duty) but with many of these Conan elements. Perhaps this would use sped up crafting and highly increased gather rates with no leveling system (start arena at max). This would also make sense to shrink down the maps to force the opposing teams to face each other, perhaps splitting it different biomes for each arena.
This isn’t a bad idea, but sounds like you want an entirely different game, and now view the Survival genre as Singleplayer, as many new games are. There is very few MMO-esque elements here, but the lore and modded servers certainly draw the RP MMO affiliated to this title (that and the fact that Age of Conan was an MMO). For those wanting more mods or waiting till mods are easier to implement, Funcom is working on making that easier for the players by many orders of magnitude with Automatic MOD installation for private servers.