You mean a roadmap for the Saudis to announce as a nuclear nation, they've had access to a small handful of Pakistan-made nukes in exchange for partially funding the Pakistani program.
So it is said, but there's too much ambiguity in that arrangement.
It might have worked for a while as an implicit threat discouraging nuclearization in the region, but assuming Iran does end up obtaining nuclear weapons capability, it's a different conversation altogether. Looking at it from a Saudi perspective, I'm not sure if I'd be okay with a handful of borrowed nukes where there can be ambiguity regarding how much control I actually have over their use (or over the Chinese-bought DF-3As with which I'll have to mate these warheads, a process where I may or may not have to involve the Chinese. More ambiguity).
Not to mention, there's a fair degree of ambiguity even in a traditional umbrella agreement. If Pakistan has to promise that they'll nuke Iran if Iran nukes KSA, that would involve Pakistan having to entertain the thought of Iran potentially nuking most of the important Pakistani countervalue targets in response. Getting nuked over an Iran-KSA war while leaving India unscathed is a nightmare scenario for Islamabad, and runs counter to the entire South Asian equation, and counter to their own self-interest. It's much more likely that they will pressurize KSA to submit to Iran's will, rather than engage in nuclear brinkmanship that might risk their own destruction while leaving their primary adversary (India) fully intact.
If I was Saudi, I wouldn't really trust the Pakistanis to go through with any such pinky-promise of nuking Iran when the chips are really down. I'd very much want nukes (and delivery systems) over which I have total, sovereign control. No room for ambiguity.
I've used the word 'ambiguity' more times than I would like but there you have it.
Given that SA is full Wahabi fanatics giving them such nuclear-technology is a bad idea (No doubt giving the IDF leadership pink fits).
True, but if the decision was to either enable the Saudis to enrich under US monitoring or to let them go to China/Russia for an under-the-table deal, it's not hard to imagine why US might go through with it.
That said, it seems they're now saying KSA needs to recognize Israel in order for the deal to go through:
https://www.bbc.com/news/articles/cwye71yq8wwo
I reckon there's still to be many flip-flops. Nothing is set in stone yet.