Currently i have ye goode ole Saitek Cyborg 3D USB running with Kerbal Space Program on my iMac under OSX 10.10.1. It is fully supported and would still be a good choice for playing E : D.
On the other hand, the Saitek Rhino 55 HOTAS seems to be a good choice in my opinion. It consists of two different pieces, each with its own USB connection with no fancy monitors and three way toggle switches (the switches are actually simple push buttons, that snap back into starting position after clicking them), a full compatibility with the Mac OS input manager seems not not to be a big concern. The fact, that it is fully compatible to xPlane 9 and 10 on OSX for example, as stated on the Saitek website, points to a full compatibility with the standard input manager. So, even when there will be no control template available for E : D, a manual setup is pretty easily done in no time.
Waiting for the mac version myself, i have already ordered a Rhino 55 yesterday (just could not wait

), so i can test the compatibility with existing software soon.
I will drop a line here, as soon as it arrives (and will start constructing a nice cockpit setup if it works...)
(The seller said, 4 days until it will leave the stock, so expect further posts around next weekend)
[EDIT] And a little update. As stated on this
website, the Rhino 55 is fully compatible to Mac OS 10.8.5 and above.