That sucks... Maybe a portable amp with a low output impedance? Ideally less than 1 but less than 2 should be more than fine.I know, not exactly ideal. But I'm sure there's at least a few tiny and cheap ones that would be just fine in a pinch such as this.
You could even use thin Dual Lock tape to make it a clean looking connection.
I really like the idea of having just one pair of IEM that is a great all rounder. Also I feel that the seal on the ASG-2 isn't as great as other IEMs out there. I work in a lab and when I'm around some of the machines, I can hear them (with the silicone tips mostly, its much less noticeable with the foam tips). Contemplating the JH16 as that will fix the isolation issue, and I think the BA drivers for the bass will get rid of the excessive (in my opinion) bass and midbass present in some songs but all songs. There's a lot to love about these and I can see why there's so much rave about them. It just may not be the perfect match for me, but I still wouldn't mind owning and using them.