Ok, to kind of answer my own question: it seems that any JFET within the “standard” spec (for pedals) will work. However, that doesn’t mean it will sound good. I’ve spent the morning popping in all sorts of different JFETs, and they all sound different. I’ve zeroed in on some SK193. I’ve also have a 5089 at Q1. Of course, it’s not 100%…it sounds a bit gated on the attack. But I suppose that’s another thread…