Just to add an update, Marjie H. at Eagle was kind enough to hook me up with the instructions on the CIRAS--sadly they're a PDF email attachment so I don't know how to upload them.
Lesson here is don't be afraid to reach out to OEM's for help no matter how big they may be or how small you are--all you need is for one person to see your email who sympathizes with your situation and they can seemingly move mountains you would have never expected.
Bump with a dumb question... since this application doesn't require ballistic protection, any suggestions on ballasting a plastic faux-MICH (I'm looking at Rothco as a "representational") up to proper weight? I'm assuming color doesn't matter once I have the helmet cover slapped on, and maybe I can hide some weights between cover and helmet and/or between helmet and liner.
Wear a steel helmet for both uniforms. Weight difference isn't much. You don't have to spend a lot.
You're going for Dome of Obedience ass-pain.