Help requested - I'm in a bit of an annoying pickle.

[Catamer]

RAF is only good to 60 so don't bother if you just want one more toon.
transfer the extra shaman to your main account and you can quest the solo character out-of-team to 80, he just needs to tag stuff before your 80s smoke it and you should be able to a lot lower level instances as needed. you could always make him enhancement while leveling for the fun of trying another spec.

[Moorea]

you can quest the solo character out-of-team to 80, he just needs to tag stuff before your 80s smoke it

As far as I know you won't get more xp if you're out of group and most of the dmg is done out of group by a level 80 (or more) than if you were in the group - no ? (and out of group you have the risk to not actually tap and get the mob killed by the wrong side)