Changing emoji fonts?

Anyone know how to get this working? I’ve installed a different emoji font, and I’d like to have it used as the default for applications and Plasma.

Relevant bug / wish:

I used to install a custom emoji font (GitHub - C1710/blobmoji: Noto Emoji with extended Blob support · GitHub) years ago, but it entailed lots of fiddling around with fontconfig and was quite frustrating. Would be really cool if this could be done easier.