Changing the Icon of Macro using a macro.

Is there a way i can enter the filename of an Icon into the macro editor and have it change the icon of a macro. 

When i learnt the macro - it stores it as the background code for that file.  - But when it runs it does show the associated macro with the correct icon name.  


I tried to manually enter xyz.png after ICON ICON to not success.  I was hoping to have a simple template i could edit - without having to relearn each time - and then remove the excess code lines.   
My example i am using it for is:  Show Control On  and off and i have a Icon showing its status - to put on those nice fancy oled buttons. 

Cheers for any help or guidance.

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