Huma seems to have built one for the impact and I hear they have one for the streamline as well. Any idea why it’s taking them so long to get one designed for the crown ? From the looks of it, it’s not very different from the impact reg.
If you have a crown with 8mm washers on the regulator then you can use the Huma Impact regulator. If you have a newer crown with 10mm washers you'll have to wait on the one they are developing now.