Rules Link - Insert into System Node Content Template Variant
I appear to have found the answer to my original question above and solved it, though I'm not too sure if it would be the ideal (correct) approach, but it's ideal for now.
After reading this post Use content panes as blocks I approached my issue by using a Mini Panel to include the said Rules Link, it worked fine.
Put simply, I just created a Mini Panel, included the Rules Link as Content (see how in the above post), saved, then went back to my original Node Template Panel Variant, edited and included as a new Content in the Panel Editor, then saved that Panel. Voila!

You may have to fiddle with the Override Panel headings etc to get rid of any unwanted shown text: i.e Panel Name (I justed wanted the Link URL to trigger workflow and not the actual Mini Panel Title, so use the 'Override' Title option). It couldn't be that easy? well it is.

Sometimes I think we may over complicate Drupal, now in my opinon we shouldn't, we just need to see the wood from the trees. Clearly I'm learning Drupal, so will you.