Unit Frames if not in the same party in a BG?

I'm looking for an addon that will let me see all of my shaman even if they are in the same raid, but aren't in the same party. I'm most interested in seeing each shaman's casting bar in particular.

I know the easiest solution is to ask the BG leader to put all the shaman in the same group. That doesn't always work.

My temporary workaround is to use an addon called "Main Assist" (availablethrough WoW Ace Updater) and this will let me see the health of each shaman, even if they aren't in the same party as me. Main Assist does not have an option for casting bars, sadly.

I really like Pitbull -- except for raids, and in circumstances where each shaman isn't in the same group, it takes more than a glance to figure out who is or is not casting. It will also show the casting bar of every member of the raid, which is a needless distraction.

Thank you very much for any assistance in advance.

Try dragging out the shaman class on the default blizz UI, not sure if it does castbars, but since you can have them grouped by class there I'm sure there should be an option for the same in a setup with castbars like you have.