I've done that.
The block still comes it at the wrong Font size.
In the image below, the block's strings are at 8pt.
The "DESCRIPTION" string under the block is at 12pt.
The options are set to 12pt.
I thought it was the "Use document Font" setting that was toggled OFF; but, it was toggled ON after all.
So, rather than relying on the drawing to render the table correctly, I was hoping to force Font settings onto the strings as I create them.
I just solved this by creating my own REV template and calling that one in the code.
I was hoping to keep the out-of-the box one; but apparently that one has the Font size pegged at 8pt.
The "Use Template Setting" option in the document's options settings seems to have no influence over which font is used in the table - the template's Font always seems to win.
The "Use document Font" setting also appears to have no sway over the table's Font size.