using internal APIs,

val taskNames = objects.domainObjectSet(String::class)
tasks.withGroovyBuilder {
    "whenElementKnown" {
        taskNames.add(getProperty("name") as String)
    }
}
taskNames.all {
    println("$path:$this registered")
    tasks.named(this) {
        println("$path:$name configured")
    }
}

seems to work for me, but no promises