Okay. Not a straight-forward tool but -
"Q. How to change the direction of text in complex linetype in arcs?
A. Texts in complex linetypes (e.g. in the standard AutoCAD "GAS" linetype) is drawn in the direction the line was drawn. But arcs are drawn by AutoCAD always in the same direction, so texts always face inside arcs with their top side.
If you convert an arc to a polyline (_PEDIT), you can reverse its direction and then the text changes its orientation (if you have the object property 'linetype generation' set to On)."
Next, you need a routine to reverse the direction of the pline. I've tried 2 routines this evening but neither worked correctly in A2006
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Sorry, I don't have any more time this evening but Google search "reverse polyline" and you should find something.
Luck.