[Zope] dtml-sqltest to support SOUNDEX?

I think I've determined that there's no clean way to specify a function to be used on a sqltest variable. I'd like to be able to do something like <dtml-sqltest soundex(lname) column="soundex(last_name)" type=nb optional> but it doesn't seem possible. I hope that I am missing something. Yes, I know there are lots of kludges to get around this, but then I lose the clean design of sqltest - especially if I want to use "optional" or "multiple". Any suggestions? Thank you. --kyler