proxy media and full resolution media must have matching audio channels

The workflow I'm trying to achieve is mobile edit in premiere rush with the Pxw fs5ii in camera proxies then open project in premiere and replace proxies with full resolution. 

This would enable me to start editing in rush mobile on my way home from job, eliminating having to have computer with me having to load project into rush desktop and having to have computer generate proxies 

Has anyone figured out a solution to this premiere must be capable of doing it as when I use the 4k xavc l 4 channel files in premiere rush it creates 2 channel 1080 h264 proxies which I can edit on mobile or desktop rush and then when I open rush project in premiere it replaces the 2 channel audio proxies with the 4 audio channel xavc l files with no problem. 

Yes - this workflow makes no intuitive sense to end users. The whole point of proxies is that you're linking two video files with completely different settings. Audio should not get in the way of this linking, just like video currently doesn't get in the way. The error message that pops up when attempting to attach full resolution media to files with mismatched audio ... imagine if that error message also said "the video settings don't match." The user is going to think "duh, that's why this whole workflow exists, so I can link media with different settings."

Following that logic, this is a giant design flaw in Premiere that breaks one of its most useful features for editors.

This is a total pain in the butt.