I would to use a couple of icons from Font Awesome.
I see that we can download the entire font-awesome directory and use simple code like
Perhaps this helps: fontello
fontello lets you choose your icons and compile your own version
You can use Icongram. It helps you to import required icons from various libraries like FontAwesome, Material etc. If you need more customization not sure if it will help you but it can cater to most use cases.
With Icomoon, you can choose a subset of icons and create your own custom icon font, and it's not just for Font Awesome, they have other libraries.