Dodged a bullet there. Then again…in another universe maybe she’s regarded as the first and the best Bond today?
As for Stewart, it probably also occurred to Fleming that Stewart’s name very likely meant a veritable box office. I think all the names toted at the time tended to be established actors - which in turn would have meant bigger paycheques. But it would seem no a-list actor back then was prepared to sign up for a series. Even if Hitchcock had picked up Bond, even if Stewart had been his 007, it’s very likely it would have been a one-off.
(On a side note: maybe Hitchcock would have been more interested in one of the odd Bond adventures like FRWL or TSWLM. He rarely used ‘straight’ secret agents, preferred amateur heroes and often looked for material with a strong female role.)