Lord Pendragon said:
This is certainly a workable solution. Is it core? If so, could you give me a reference where you found the text.
Not exactly core. It's the spirit of the core rules, but not the letters.
Here's the excerpts that makes me say so:
DMG 3.0, page 147--148: Friends (allies, cohorts, and hirelings):
Allies
Allies come in two types: those who help the PCs with informations, equipment, or a place to stay the night; and those who actually travel with them on adventures. The former makes useful contacts and resources. The latter functions as party members and earn a full share of experience points and treasures just as any other character does. Essentially, these latter allies are adventurers who just happen not to be controlled by players. They differ from cohorts or hirelings who work directly for the PCs.
Cohorts
[...] Because they're not making a lot of decisions or helping much on the strategic level, they get only a half share of experience. Although the PCs can work out their own deals with cohorts, they usually get only a half share of treasure too. [...]
Hirelings
[...] Hirelings do not make decisions. They do as they're told (at least in theory). Thus, even if they go on an adventure with the PCs, they gain no experience and do not affect any calculations involving the average character level of the party. [...]
Familiars, mounts, and animal companions are treated like hirelings -- they gain no experience and do not count as members of the adventuring party.
Since you do not want them to become DM NPCs (you want to control your
awakened companion), you need to treat it as a cohort rather than as a hireling. Thus, you need Leadership, or a similar arrangement with the DM...
Since there's precedent for using Leadership for better helpers (notably, for getting a dragon mount for the paladin), that's the solution I would use.
As you see, it's more gut instinct and interpretation than black on white rule text.
The DMG 3.5 (pages 104--105) says essentially the same thing -- the calculation for a cohort's XP is modified and better detailed, and there's a Follower entry that says that, like hirelings, they don't gain XP. With the exception of the cohort's adventuring paragraph, the text is not modified.