Your inclusion of Gradle in point (3) is in tension with point (2) in that Gradle runs at snail's pace. I do wonder whether running Gradle atop Graal will help

Your inclusion of Gradle in point (3) is in tension with point (2) in that Gradle runs at snail's pace. I do wonder whether running Gradle atop Graal will help with that problem, though I guess to get the benefits Gradle would have to be both built with and running build scripts written in statically-typed languages only, i.e. Kotlin instead of Groovy. It might even stop the developer exodus from Gradle to Bazel.