Use Multi Editor to Batch Values in Blend Track Editor?

Question

AFAIK, it is not possible to use the Multi Editor to swap out Y (voice, pitch, etc) or X (RTPCs) axis values in the Blend Track Editor.  This would be very useful in times when one needs to point MANY X axis values to a new RTPC.
Currently the only Blend Track multi editor function I can find is Blend/Play Mode = step or continuous.

In the picture below, for example, I'd like to be able to point all the X Axis values to a new RTPC, but not have to go in one by one and right click, navigate to and select the new RTPC.  I want to be able to multi edit these values for all the blend containers I want, and point the selected to a new RTPC.

If there is a way to currently do this, please let me know.

Thanks!