You can also make it happen by using Downshits in mq2melee section of ini. Since champion is a group buff, on shaman you'd add to his. I have some buffs that are single that I want to keep up on tank set up in tank's ini, with the buff set up on caster in MQ2AutoBuff - if it drops off the tank, he sends a tell to the buffer, buffer casts buff on him. Spelling is important - a misplaced letter can have the buffer casting over and over.
There are a number of both downs (evaluated ooc) and holys (evaluated in combat) listed in the wiki - easiest way to find is the all pages link there, its one of the first few listed.