I have a 28% plane that I'm looking into putting a Spektrum DX7 in to. I need to be able to put my elevator servos on some kind of Y and for personal preference, I would like to either using the Equalizer 3D or a Power Expander. I currently have your BatShare going into your Regulator, which is the one with 2 inputs and 2 outputs.

Could I use the Equalizer 3D on the elevator channel and plug the 2nd output from the regulator into it to attain redundancy?

If not, could I just plug the 2 outputs from the regulator into free servo slots on a Power Expander Sport?

Hi Ben,
You could do the first, plug the Equalizer 3D into the recevier and split the power. You really do not need to use a 3D and its aux power input on that size plane, I would recommend a Equalizer II and plugging the other power lead into the receiver using a small Y (I think 3" Ys are available) on throttle. I would not recommend using the regulator you have with the PowerExpander Sport the way you propose. The servo outputs are not meant to handle more current than the servo requires. You could do this but you would get extra voltage drop going into the PowerExpander.
Please let me know if you have any other questions.