Are you aware that Lomo is putting out a new Petzval-ish lens aimed at 35mm cameras? Their effort is all new-manufacture but it seems to me that their focal length is too long to get any good swirlies. Still, their kickstarter was very thoroughly funded which bodes well for the market size on new Petzval lenses.
I too shoot RZ so this is not an option for me. I do realise that making an RZ lens is a big technical undertaking (electronic shutter) though, so I don't expect you to change your offering to suit me.