Okay, here's a rough conversion. I did it as a modified form of the "Psionic" template out of the Psi-HB
Creating A Vagabond
“Vagabond” is a template that can be added to any corporeal creature that has an Intelligence score (hereafter referred to as the “base creature”). It uses all the base creature’s statistics and special abilities except as noted here.
Hit Dice: Same as base creature
Speed: Same as base creature
AC: Same as base creature.
Attacks: Same as base creature.
Damage: Same as base creature.
Special Attacks: The vagabond retains all the special attacks of the base creature, plus it gains the following special attacks.
Psionics (Sp): The vagabond possesses psionics abilities equal to that of a psionic creature of equal HD (see PsiHB pg. 139). Vagabonds never have powers from the Psychokinesis discipline, however.
Psionic Attack/Defense Modes (Sp): A vagabond possesses all psionic attack and defense modes.
Special Qualities: The vagbond retains all of the special qualities of the base creature, plus it gains the following:
Telepathy (Su): A vagabond can communicate telepathically with any creature within 100 ft that has a language.
Immunity (Ex): A vagabond is immune to all mind-affecting magical spells (not supernatural abilities or psionic powers).
Saves: Same as the base creature.
Abilities: Same as the base creature except that Intelligence is changed to 18 and Wisdom improves by +4 and Charisma increases by +2.
Skills: Same as base creature
Feats: Same as the base creature.
Climate/Terrain: Same as base creature
Challenge Rating: Up to 3 HD, as base creature +2
4-7 HD, as base creature +3
8-15 HD, as base creature +4
16+ HD, as base creature +5
Organization: Solitary or as part of base creature’s organization
Treasure: Same as base creature.
Alignment: Any
Advancement: Same as base creature