Well, I think there is.
Long time ago I have a discussion with the QTAC and came to do the idea that one can “link” two Quintums via “border element”.
One will be master, the other will be “client”. The client will “advertise” to the master its supported prefixes, that will match the hop-off patterns of the master.
But here an obstacle comes – the maximum simult call limit of a Quintum box.