Double Butted spokes for 19"

Now that Tartybikes no longer wants to stock Sapim’s custom cut shorter sizes for 19" builds, does anyone know any store anywhere that has any 19" wheel compatible spokes?

To be specific I’m after 164mm ones. That’s at least a good 10mm shorter than BMX’s common ones.

If anyone has an idea where it might be possible to get some, post in here!