I have checked in a dead-simple extension "TemplateLink". It should solve the ISSN issue (and maybe become a replacement for ISBN as well?), and potentially many more.
Linking to Special:TemplateLink, you can pass a template with parameters as parameter. The separators "|" of the template have to be replaced with "::", otherwise the parser will mess up (or I'll have to mess up the parser;-)
Example: [[Special:TemplateLink/test::param1=value1::param2=value2]] links to a special page that will display "Test" (variation configurable in i18n) as title and {{test|param1=value1|param2=value2}} as content.
Potential problems: * "::" might be confusing. Then again, this will mostly be hidden in templates like {{ISSN}} anyway * Limits on template parameters: short, no wiki or HTML markup. Not fixable unless we move from the [[Special:]] link to tags. * Loss of page-specific parameters like page title. These can be passed as an extra parameter to the "stand-alone" template, though.
Magnus