I am successfully using a mixture of the default Eva icons and Font Awesome icons with Nebular 4 in Ngx-Admin. I can configure both NbIcon and NbMenuItem components to use either the default Eva icons or Font-awesome icons using the "pack" config parameter.
There does not seem to be a 'pack' attribute for NbActionComponent and it also does not accept the icon attribute being supplied in the format: {icon: 'globe', pack:'font-awesome'} (which works for menu items).
How exactly do I set an nb-action to use any icon not in the default icon pack?
icon attribute takes an icon name or an icon object, have you tried:
<nb-action [icon]="{icon: 'file', pack: 'solid'}"></nb-action>