Well, if it were me, I'd drive 10 miles to the On Rope 1 store and ask Bruce to "fix" it for me.
'Course, that doesn't help you at all does it?
I like the floating tie-in in the pic you showed. I thought the rope portion on this rig is replaceable, but I sure don't see how one would replace it.
Tough situation SRT, unless you can do mods yourself, what about contacting On Rope 1 and discussing it with them. They make harnesses, etc. mods and repairs and fabricate much of the PMI and other manufacturers "software" as well.
That's the best I can do.