Info from dunlop is hard to find on the net, not surprising I suppose given the age of our bikes if they are not “supported” by dunlop.
However, dunlop do “support” modern 500cc single royal enfields, which are pretty similar to our bikes in terms of weight and horse power, and tyre size. They are included on their application documents, and recommend 5he k70 as an approved fitment, with front 24psi, rear 32psi. See pic attached.
To some extent I think this adds weight to the opinion that the newer k70 tyres need to have higher pressures than those made in the 50’s and 60’s.
Just my 2 cents worth.