Cascading layers support (or workaround using plugins)

[pearcake]

Hello, I have existing project (mini-library) that uses JSS and MUI, and I would like to wrap all my CSS rules in @layer layername {} container for easier integration with other styles. I know that it probably will take some time until it will be supported at library level, so the fastest and easiest way is to write a plugin as far as I understand. Can someone point me in right direction? So far I checked some official plugins source code, like "nested" plugin, but it looks like re-parenting every rule is a bit of an overkill. Any ides?

[pearcake]

Bump!