I could see that, though we might need to provide some directions for the DM on how to use it (does it affect the caladrius's reaction vs Handle Animal, etc?).
Good question. Perhaps the caladrius may use its ranks in Sense Motive in place of the static DC for Handle Animal checks? We could give it Skill Focus and/or a racial bonus on the skill as well to make it worthwhile.
In that case, should we remove "using the "Influencing NPC Attitudes" table of the Diplomacy skill" and add "opposed by the caladrius's Sense Motive check"? At the end, we can note that the caladrius's Sense Motive gets a bonus when opposing Handle Animal checks due to being a magical beast.
With that change, the racial bonus to Sense Motive, etc, is this basically done? I'd say these are about CR 1 as a "social encounter." Let's give them some advancement: 2 HD (Small), 3-4 HD (Medium)?