Thanks. I hadn't really given much thought for any widespread practical use. I think the throughput would be the limiting factor, on average (using my encoding scheme, which could definitely be optimised) you average about 5.882 Bps. Would definitely be interested in hearing what uses people see for it though!

The first thought that comes to mind is Tor's pluggable transports used to bypass censorship.

Admittedly 6Bps isn't good enough for that (I think), but it might be possible to combine it with other mechanisms or increase that number?

https://www.torproject.org/docs/pluggable-transports.html.en

While TOR represent the worst kind of the variances of inter-packet delay of all network topology, the devil in the details is compensating for the largest “single-hop”-like variance.

Ummm, think of those dedicated phones between two ATM switches in the old days.