Non-holy pally healing gear

[Pantalaimon]

As long as you're 8th or 9th, no, it wouldn't be an issue. Healing needs only be sufficient; after you've reached that point with any number of healers, adding additional healers won't really add anything (other than ease slightly up on the other healers).

But if you have to replace a healer, you have to focus on MP5.

To be fair, this discussion is pertaining directly to the OP's original situation - raids where he tanks some fights or perhaps trash, and then does a gearswap for the bosses where tanking is not required. So essentially he'd always be an 8th or 9th healer and/or cleansebot.

Don't get me wrong, I wish our holy pallies would focus more on longevity and less on HPS:P But I'm tempted to bow to Mordekhuul's experience in this matter, since his situation is exactly what Swirly had in mind.