This might have been suggested before, so bear with me.
As an optional hireling option, allow players to hire their own characters as hirelings from the character sheet on their server.
The hireling AI algorithms would work as they usually would. You'd be able (using the new U23 revisions) to select two common effects or attacks they would use. You'd use the same hireling control bar.
The hireling avatar could use the equipped gear, and any buffs that persist on logout, and would look the same in terms of any cosmetic effects. They would not gain experience, but would gain certain hireling effects (weapons and equipment would be immune from damage, as would any inventory items).
As with other hirelings, you can't switch out gear on the avatar in that mode.
If implemented as a F2P, you cannot use an avatar greater than your character level, and may require you to unlock Favor to gain the ability (perhaps 600 total Favor). A Premium or VIP must also unlock the ability with Favor and could use a character up to 2 levels higher, like a Gold Seal. Anyone could also buy the ability from the DDO Store.
To keep the implementation simple, only hireling classes existing in-game could be used. (Sadly, no Monks.) A multiclassed character could be used (provided any of its classes are also hireling classes) but may be less effective as the hireling AI may only use the traits of the dominant class.
Hireling rules still apply. You can't bring your other selves into raids or solo quests.
You may only use one character avatar at a time, but can use regular and Gold Seal hirelings with an avatar.
Most importantly, playing (literally) with a version of yourself permanently removes your right to b!+@# about how "crappy" your hireling is on the forums.
What do you think, sirs? #MST3K