Mac keyboard shortcut for Alt+4 now resolving to ¢
I used Karabiner and added a custom shortcut:

&lt;?xml version="1.0"?&gt;
&lt;root&gt;
  &lt;item&gt;
    &lt;name&gt;Override alt4&lt;/name&gt;
    &lt;identifier&gt;private.always_send_four&lt;/identifier&gt;
    &lt;autogen&gt;__KeyToKey__ KeyCode::4, ModifierFlag::OPTION_L, KeyCode::4, ModifierFlag::CONTROL_R&lt;/autogen&gt;
  &lt;/item&gt;
&lt;/root&gt;


I then bound my actual spaces shortcut to Control4.