You can do it manually if you take it on yourself and offer a patcher that people who own the font can use. But most of the time, it is not going to be aesthetically pleasing to the font designer.
This is what Berkeley Graphics says about it in the article that is linked:
>Nerd Fonts: We don't mind our customers patching the typeface. We respect your ownership of the typeface. However, Nerd Fonts are put together [haphazardly](https://www.nerdfonts.com/#home_) from several difference sources, kind of destroys our typeface's cohesiveness: We do not endorse it, we don't provide support to do this. It is a bad idea despite of its questionable usefulness. They're popular though and if you don't mind breaking the aesthetic uniformity of our typefaces, please go for it.
You can do it manually if you take it on yourself and offer a patcher that people who own the font can use. But most of the time, it is not going to be aesthetically pleasing to the font designer.
This is what Berkeley Graphics says about it in the article that is linked:
>Nerd Fonts: We don't mind our customers patching the typeface. We respect your ownership of the typeface. However, Nerd Fonts are put together [haphazardly](https://www.nerdfonts.com/#home_) from several difference sources, kind of destroys our typeface's cohesiveness: We do not endorse it, we don't provide support to do this. It is a bad idea despite of its questionable usefulness. They're popular though and if you don't mind breaking the aesthetic uniformity of our typefaces, please go for it.
Nerd fonts comes with a patcher that can patch .ttf fonts to add all the icons. I've never tried it but I take it it'd work?