The only (easy) way I can imagine right now is having the same EA on those three different charts and when a potential entry is identified, an Alert message pops up and let you know which one it is. Then you can take the decission to open the trade manually.
Obviously you can also create a fully automatic way but the human decission (your decission) is apparently required no matter waht so I would not dedicate time and efforts to implement such an EA. The previous option gets the same result with a lot less effort.
