Key Value Property Editor

Could this be something that's good for this? 

It was my attempt at a custom property editor. I never got the sort added and got a bit lost with a few bits. 

Would be great to have this done in "an Umbraco" way and release as a v16/17 package. 

Here's was as far as I got.
https://github.com/cheeseytoastie/Umbraco.Community.KeyValuesPropertyEditor