Pretty sure the only way to tag multiple extensions is through the X wildcard. This is why on most systems we deploy if there is a need to have different Dial Patterns setup for different groups of phones we set the first digit to something that doesn’t overlap.
Estefania, if you click on the “Pattern Help” button at the top of this page it will give you the options for patterns that you have available to use. So while not able to reduce to a single line it can be brought down to two.