You can easily make it so that pressing ^L inserts a control-L character. Just create a snippet in the bundle editor, and type control-Q, control-L into the snippet definition. You won't be able to see it in the editor window, but if you typed it, it'll be there. Then set control-L as the shortcut key for that snippet. Voilą!
For going to the next ^L, you can just record a macro that does a search for it. Again, you can type control-Q, control-L into the search box.
The only problem is that, as Rob said, the only way you can see them in your document is to Show Invisibles.
Robin