Before you start blithely assigning keyboard shortcuts, you should understand the keyboard shortcuts that Pages 8 already offers, so that you do not introduce conflicts. That link content is also available from the Page 8 Help menu.
Basically, if it appears on any Pages menu, and/or does not have a keyboard shortcut assigned, you may be able to add a unused shortcut from System Preferences : Keyboard : Shortcuts : App Shortcuts. The menu item must be typed exactly as it appears on the Pages menu. Note that an ellipsis is added via option+semi-colon on U.S. keyboards.
You can add repeat symbols to the Keyboard : Text panel, where you use unique trigger letters in the Replace column, and the actual replacement character (or words) in the With column. From the character viewer perspective, you would place your cursor in the With field and double-click to insert the special character or character sequence that you want automatically inserted into your document, and then press return to set it. In Pages Edit menu : Substitutions : √ Text Replacement ensures this will occur. There is another text replacement in Pages Preferences : Auto_correction if you want the text replacements unique to Pages 8, and not System-wide. Correct spelling automatically may interfere with these replacements.
Example:
I entered the trigger word followed by a space and it was automatically replaced.
N°̱
