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IMO it's simpler to define a Gradle plugin in your included build. even if it's an empty plugin, you can

plugins { id("com.example.my-included-build") }

to bring the included build into the buildscript classpath of whichever projects you want to use it in

Thanks! I thought I had tried that, but I guess something was off in middle of my refactor that made it seem like it wasn't working.