It can be done, but the position in the UK is that with the Internet service covering over 90% of the population by other means, PLT will probably be a non-starter in this country. Some of the providers who were going to implement it have already pulled out indicating it being unviable.
There is also the big question about likely interference to other radio services, particularly when the new digital services start appearing on the medium and short-wave bands. Digital Radio Mondiale who will be one of the providers of the new service has already expressed concern. So if it’s true, it will be of particular interest to them being a French company.
I will check into it further and post back if I find anything, thanks for letting us know.
It’s a subject very close to my heart!