I have to agree that most of the Triangl/ Dublo releases from the early mid 60s have been covered recently, as for newly tooled singles IMHO they’d sell like hot cakes. Even myself, a convinced southern enthusiast would fall for a Dean single and number 123.
As for an L1 I would be very down for an L (some of them were based at Eastleigh in the early 50s), but I’m hoping some eastern section experts could answer wether an L1 could also be the base for E1/D1 models?