From what I understand AS/Halliwax’ machining might be completed before ours.
Maybe one of them knows where they are at
If you want the heaviest and that is your primary goal: get a steel Roman’s and put a steel core in or make it motorized…. Though I don’t know how you would as the internal assembly is about the same as the MK1FX.
Dave’s run is complete so that would need to be a second hand buy but considering it is a static, despite aluminum, would still be pretty hand heavy if installed with a motor assembly (or again) steel core)
For that matter, any aluminum FX hilt could have steel added in the core if you plan it out and only intend to display it.