Flush setting in Fine Silver?

I have a design for a pendant made of fine silver with 18k yellow
gold granulation. After the granules are fused to the sheet (26 ga)
I will solder a thicker piece of fine silver sheet (18 ga) to the
back so that I can flush set some stones on the top. It occurred to
me that maybe the fine silver is too soft to flush set?

Any feedback you have would be appreciated!

Thanks,
Jennifer in Denver