My suggestion how to solve "single target curse" for hunters. Chimera is chosen since it has 2 heads, 2 heads - 2 attacks.
Aspect of the Chimera
All your single-target attacks duplicate on one nearby enemy dealing ?? % of damage.
You cannot achieve best single-target dps with Aspect of the Chimera since it doesn't inherit 15% AP bonus from AotH. So it would be indeed specialized multi-target aspect.
Currently Aspect's mechanic seems very artificial. AofC has no use in PVE at all. The only way I can use it is a bit faster corpse run after wipe. Those hunters have the only real pve aspect which looks like baseline passive ability.