Run macro with keystrokes

I have a simple macro that toggles the color of selected cells. If I run it from the debugger, it works fine. However I have been unsuccessful in creating a keystroke combination for it. I am using Excel 2011 on a MacBook Pro and my Excel files are .xlsm. My macro workbook and the macros are all xlsm.

I have tried many different keystroke combinations using CTRL-CMD-letter.
I cant find any single letter that works. I also tried ONKEY and tried to define a key to simulate the ENTER key since there is no ENTER key on a MacBook Pro.

Here is the macro that works from the debugger:

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I have tried several different versions of OnKey, none of which work. Here is a sample:

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I've been working on this for months. In Personal Macro Notebook using xls files of prior EXCEL versions I used the key combination of CMD-CTRL-q to run Yellow
cell flawlessly.

Thanks John, but your code shows the shortcut as "Ctrl+a". My version requires CMD+OPT+(one text letter that is not a system command shortcut). I recorded a nothing macro, set the keyboard command to CMD+OPT+e , pasted the original working macro code into it nd it works. I had to try many keys before I found one that worked.