Best (and safe, non-bannable) way to boost two mages using three 60 mages?

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I have a warrior/priest/3x mage team.

For raids and playing with friends (many of whom tank) I want to level up a mage on the warrior's account and on the priest's account. That way I can run 5x mages (easier for raiding) or 4x mages and 1x priest (flexible addition to any group or raid).

I'm anxious about pulling dungeon mobs and dropping party before AOEing down -- blizz has banned a few notables for similar conduct. I'd rather something a bit safer.

• One idea is to have the two mages in a party and the three 60 mages out of party and on follow. I'd pull (but not damage) a bunch of open-world mobs on my 60s, AE the mobs to 75% with my lowbies, and then nuke the mobs with my out of party 60s.

• Another idea is to just pull a dungeon and AOE with however many 60 mages I need to reliably clear in one or two pulls. But the exp will be gimped by the presence of the 60s and I'll definitely hit reset cap quick -- maybe do this every hour after farming random mobs?

Any other thoughts/schemes would be greatly appreciated. I'm sure many of us who are soon to cap will be boosting other toons in the near future.