Increment number in material style sheet string

[forbidden14]

Hey all,

I'm trying to render out a crowd in mantra, and while my hair and hat styles are working, I'd like to add some variation to the crowd agent itself.  I've already baked out maps for each agent via COPs ( 8 each) and the idea is to create a style for each agent, in this case M_01_*.  I'm Trying to randomize the highlighted number in the img attached and fit it  00-07 based on @primnum or @ptnum if possible?  Or can you directly use an attribute value in Material style sheets?  I could just create an integer value per agent via vex then somehow use it in the style sheet?  

 

Thanks in advance!

 

Edited May 30, 2022 by forbidden14