to come back to my previous question about header and footer widgets, i created a file in my plugin called sidebar.php which will show custom widgets. How can i override my themes' sidebar.php template with the one i created in plugin. the thing is, i'm using a child theme from the new twenty twelve theme, so the actual sidebar.php file is in the parent theme.
The reason why i don't want to put my modified sidebar.php template in my child theme is that when i switch themes, i don't have to copy it again to another theme.
any help will be appreciated.