Pure Cleric seems to only be nice with radiant servant, which only boosts every 5th heal. I haven't tried it out, so I don't know if there's a counter or something to keep track of it, but doing it mentally would be a pain. So I would recommend multiclassing as well. Ranger actually has a significant positive energy boost from just 1 level, various 2 level splashes give free feats, low tier enhancement goodies etc.
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