How to make own visual for wall builded only from one material?

[Poroh]

Hi all
I have a custom material and i put it in 'stony' category. But when i build vanilla wall from my material i want to use own texture. i dont want to override vanilla brick appearance texture. and i dont want to add additional wall.

I tryed to set own appearance to <stuffProps> in my material, but it was found that appearanse is enum and i cant do anything with it.

how can i do this trick?