I think you are making the whole thing too complex.
As Vryndee said, just get one (1) broadcast software running on your Quad-core system.
Look at your keyboard. Find buttons for the pally around the buttons you use to play your druid. The F-key row comes to mind.
Edit the keyboard mappings of your pally. Unbind basically everything. Bind F1-F12 to Actionbar1 Slot 1-12.
Put the stuff you want your pally to do in the action bar and find out what you want there.
I'd recommend to go for heal macros with pre-defined target, such as /cast [target=DRUIDNAME] flash of light, and make them for both chars.
In addition to that, you want to have a button for /follow druid, mounting up and drinking+eating.
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