strikethrough

Is it possible to instruct a presentation MathML renderer to use a
strikethrough character instead of the regular version thereof without
going through the trouble to code CSS? I've done some searching on
this, but haven't turned up much of anything.

Specifically, I'd like to use a strikethrough V to represent volume.

I originally expected it to be an enumerated attribute for fontstyle
at

http://www.w3.org/TR/MathML2/chapter3.html

I am especially scratching my head about how to make SVGMath+a
formatting objects processor render the strikethrough character -- at
least with FF, I do have the option of coding CSS.