Packaging extensions for Audition

OK, I'm having a heck of a time getting extension packaging to work.

I've created a panel extension that implements Punch & Roll functionality for Audition CC 2017.

It works just fine if I have signing requirements disabled in the registry -

but I've been completely unsuccessful in signing it to allow anyone else to use it.

I've created a certificate with the Adobe Exchange packager -

however, any attempts to actually package my files fail and point me to a fairly useless document to troubleshoot it.

I also note that most of the documentation AND tools do NOT list Audition as a product to install for.

(I do have Java installed and properly pointed to)

I've also used the online tools at Adobe Exchange 
I was able to generate a .zxp  and download it.

However, attempting to install it with ANY tool fails - for instance, exmancmd.exe gives me a -252 error. (using admin privileges)

There is SO MUCH conflicting information on how to go about this that it's daunting, and all of the error messages are completely uninformative.

Is there a way to include the certificate with the loose files and just skip the whole packaging step and have a user drop a folder into their CEP/extensions folder?

At this point I've spent more time fumbling with the obtuse packaging system than making the tool

Any help much appreciated!