I want to use plugins from a private plugin repository. We have a lot of projects, so I don't want to maintain a settings.gradle.kts for every repository, so I was wondering if there's something similar to

init.gradle.kts

for

settings.gradle.kts

that I can have my team add to their user-home?

yeah you should be able to

beforeSettings {
    pluginManagement {
        repositories {
            ...

in an init script

That's awesome, thank you!