MacBook keyboard hacks for # (hash/pound/numbersign)

One of the few annoying things about my oldish MacBook Pro is its keyboard, for example a few unresponsive keys, but particularly the lack of a # key. It’s a UK keyboard, and has £ for shift-3, and # is hidden in alt-3 (not labelled).
This is fine in native desktop apps, but less fine in [...]

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