I'm not gunning for Radiant Servant exactly. I don't have any long-term vision for the character beyond obsessive focus on healing spells and effects, which is really more of a pure exercise in rules knowledge than any attempt to actually create an overpowering character- healbot is a distinctly suboptimal role for a cleric at low levels, and a wildly suboptimal one at mid or high levels. It would be both thematically and mechanically appropriate for the character, but it won't break my heart if I can't have it.
What exactly is your issue with it, though? You mentioned it specifically as a dealbreaker in the original recruitment post, but intuitively it doesn't seem any more problematic than any number of cleric PrCs- like, say, Church Inquisitor, Contemplative, Divine Oracle, Ordained Champion, Ruby Knight Vindicator, to name only a few. Unless we're going to be hip-deep in undead...