[Parody]

Whether the Alt-replacements work with a laptop with a reduced keyboard depends on if and how the laptop manufacturer managed their numeric keypad replacement (commonly enabled with Fn + numpad replacement keys or Fn + a key designated as Num Lock when used with Fn).

Regardless, it's an option. So is leaving up the Character Map (or copy-pasting it from anywhere in general), using another application with better symbol support for typing up main text, using -- and --- for now and search-and-replacing it later, or buying a keyboard to use with your laptop. Personally I like the last one, as I don't like typing on modern short-throw laptop keys. :(