In the meantime, I did some looking and it turns out the CPO I had was for MK3 Ultimate, which has the extra block button. So for now, I've edited the file to use a facsimile I made using the logo with the correct 5-button pattern. It'll have to do until I can find a better scan.
[ATTACHED IMAGE]
----------------------
I have officially retired from sucking at everything I do. Life is much easier now.