Dynaudio Consequence UE

What is your opinion on the placement of ultra high-frequency tweeter units (like Elac 4 Pi) on top of Consequence UE?
Do you think there will be phase problems when placing Elac 4 Pi on top of Consequence UE ?
German has proven many times adding an omni directional tweeter or super tweeter can do magic to any speakers, it will also remove lots of room interference issue. I have heard the original Consequence numerous times, having the tweeter place that close to the floor does have its drawback. not sure if adding Elac will solve the design issue, but if I have to guess, it should do more good than harm knowing how a regular Consequence sounds.
Maybe you should start designing you own speakers since apparently your the expert.