Impossible to change attribute text size within dynamic block

[jamami]

I regularly use the attached dynamic block but have a big issue in that I cannot control the attribute text size without having to explode and then individually edit every bock.

The attribute is defined with a unique text style and was hoping to use that to control but this does not work, nor does trying to use annotative elements.

I tried making the text style annotative, the block it is part of and the dynamic block that contains the sub blocks - no luck.

Is there a solution to this?

 

Beam.dwg