The problem with "epic" level gamming in the d20 system is, and always has been, that the math starts to break down. Playing above level 20 means either you extrapolate the under-20 mechanics, in which case they will eventually start to collapse under their own weight, or your retool the entire system in which case the under-20 mechanics will probably suffer.
Not saying that a talented GM can't run a good game over level 20. Just that I've never seen a mechanical solutioun that didn't leave me feeling cold.
Now when you take that and, in addition to it, consider that you can get in a lot of gamming under level 20, and that 16th level characters feel prety darn badass standing next to 3rd level NPC's, one has to wonder why there is a need to smash your head against a brick wall in order to play over level 20.
If the desire is simply for a very high-power game then might I simply suggest gestalt characters? They are much more mechanics-friendly than epic-level characters. Though I suspect you won't get as much mielage out of them in a Conan game as a dnd game considering that the Conan classes are already so versatile.
As for myself, I perfer to run my games somewhere in the level 6-12 region. Just my style.
Hope that helps.