I'm not sure I know what you are asking.
With dynamic pages its really easy.
../page.cgi?t=other_templates
Where "other_templates" is a directory at the same level as default.
If you are thinking about being able to place your own templates into a different directory, and use default for the links templates, but have your script have it call templates that are located in the other directory... I had posted that awhile back, but it probably doesn't work witn 2.0x versions. It was a change to the codes in Links.pm and SiteHTML.pm that looked for a passed in parameter, and if found, called the template set from that directory. There were changes in the last 2 releases that make that suggestion invalid.
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