Making a tool for the rear hub

[JohnCT]

Has anyone tried taking a long Torx tool like this one:

 

 

.. and cutting it down behind the head to gain access to the fasteners behind the tone ring?

 

Or, would this tool work for that purpose without relieving it behind the tip as is?  

 

Thanks.

 

EDIT:  I'm inclined to try to make this tool.  Does anyone know how thin the "waist" behind the head needs to be?  I don't want to make it too thin for obvious reasons but I also don't want to knacker the tone ring either... Thanks again.

 

 

John

Edited June 27 by JohnCT
update