Can a class inside a pipeline be a subclass of the Script object?

[ZillaYT]

I have a class, say

class Foo {
  def fooEcho()
    echo "Hello Foo"
  }
}

but of course this fails if I

Foo foo = new Foo()
foo.fooEcho()

because the Foo class doesn't know about Script echo() function. The general workaround is to do

class Foo {
  Foo(Script s) {
    this.script = s
  }
  def fooEcho() {
    script.echo "Hello Foo"
  }
  def script = null
}

Foo foo = new Foo(this)
foo.fooEcho()

But this is ugly, and it means that I have to prepend ALL normal Script calls (echo, println, stage, etc.) with "script."

Can Foo be defined as

class Foo extends Script {
 ...
}