How can I get a flash based plugin to load in CC 10.x

Yes, you can!

You need to make sure that you are using: "Adobe CSAW Indesign" and not "Adobe CWSAW".

Also you need to hack the manifest.xml and write someting like this:

<HostList>

            <Host Name="IDSN" Version="[7.0,10.9]" />

</HostList>

To get it to load in CC 14.

/ Best regards

Pontus