Physically appending the items would mean that you would then have to change them (probably manually) every time your tiddlers changed. But you could use a view template.
Make a tiddler and tag it with $:/tags/ViewTemplate with the following contents:
<$list filter="[all[current]tag[HelloThere]backlinks[]limit[1]]" variable="dummy">
!!! Backlinks
<<list-links "[all[current]backlinks[]]">>
</$list>
But change tag[HelloThere] to whatever your tag name is.
This should list links to the respective tiddlers at the bottom of the tiddlers that have the desired tag.
Be sure to make a make a backup before trying this, in case I've made some horrible error!
Also, be aware that if you just want to see the backlinks occasionally, you can click on the "info" button from the drop-down menu on every tiddler. From the set of tabs that appears you can pick "References" to see a listing of tiddlers that link to the current tiddler.
-- Mark