Jon A., the owner of the modified DL-1 has sent me some photos of a couple of other bikes in his collection. A very clean and correct 1973 Raleigh DL-1 and a 1970 model.
He’s also directed me to the Brothers Rich and the modified version of the DL that they make and sell known as the Charleston.
BrothersRich sells self-branded luxury items, leather goods, etc. The BrothersRich Charleston goes for around $1800 US, not cheap, but it’s essentially a new bike, because Paul Eric Rich hunts down straight DL-1s on their last legs, takes them completely apart, repaints them and puts all new components in them, including modern bottom brackets, headsets and Shimano hubs. His main competition is the Pashley Guvnor, also around $2000, but the Guv is a 26″ bike. I think probably most of those bikes spend their lives on display (kind of a shame IMHO).