This is of course too simple, the imminent scholars would have thought of that. Marc, you say Crone did associate Moka with Mecca? Do you have a text extract?
Crone wrote:
From the point of view of the rise of Islam, the problem may be restated as follows: We seem to have all the ingredients for Muḥammad’s career in northwest Arabia. Qurashī trade sounds perfectly viable, indeed more intelligible, without its south Arabian and Ethiopian extensions, and there is a case for a Qurashī trading centre, or at least diaspora, in the north. One might locate it in Ptolemy’s Moka. Somewhere in the north, too, there was a desert sanctuary of pan-Arabian importance, according to Nonnosus. Mecca originated as a desert sanctuary, according to Kalbī; it still sounds like one in the accounts of Muʿāwiya’s building activities there; and the sanctuary Muʿāwiya turned into “towns and palaces” must have been located somewhere in the north. Jewish communities are well attested for northwest Arabia. Even Abrahamic monotheism is documented there, and the prophet who was to make a new religion of this belief was himself a trader in northwest Arabia.
Crone, Meccan Trade, pp.196-198
She also wrote:
Jacob of Edessa knew of the Kaʿba toward which the Muslims prayed, locating it in a place considerably closer to Ptolemy’s Moka than to modern Mecca or, in other words, too far north for orthodox accounts of the rise of Islam…”
Crone, Meccan Trade, p.136