Well, maybe not, but some simple thinking should get you on your way. For starters, if you use a numbered style, you would want to remove the sorting. So any
<xsl:sort select="b:SortingString" />
would probably have to be replaced by a
<xsl:sort select="b:RefOrder" data-type="number"/>
Then adding a number in front of a bibliography entry would be done by tracking down the start of each entry, which is typically a html paragraph
and add a
followed by a period, or surrounded by brackets.
But what you should be asking yourself if this is really the format that you want. I'm no expert on the ISO 690 format, but I would think that once you start changing the stylesheet, it is no longer ISO 690 compliant. So what type of style are you actually
trying to create? Is it a specific one? Or are you just looking for a numbered style where the author is always the first element? In the latter case, you might want to consider some of the numeric styles on this site like the IEEE one.