Leonardo is just one Italian company, the submarine issue is with DRASS, another company. Besides that, you also have Elettronica, which specializes in EW/ECM tech and has been promoting that to Pakistan for some time.
As for new fighters, besides some news reports and the previous CAS saying the PAF needs new fighters, I don't know what the PAF will do -- or can do -- for something before Project Azm. The PAF could try leasing second hand Typhoon T1s from Italy, Spain and/or UK as a stopgap until Project Azm.
The T1 isn't much better than the Block-52+, but from a big picture lens, it'd at least shore-up medium-weight jet numbers and give a perceptual boost (i.e., make the IAF worry a bit more). The Consortium might even be willing to offer the T1s on lease for a discount if the PAF could order 18~24 new-build T3s, but that'd cost $5-6 bn.
But the T1 in of itself really doesn't do much for the PAF, it'd be the T3 with the MBDA Meteor and unrestricted SOW/ALCM compatibility that would matter, but it's prohibitively expensive.
As for long-range SAMs. I think it's either China or wait for Turkey's SIPER. Personally, I'd rather we save the money and get a proper hit-to-kill capable system such as the SIPER in around the same timeframe as Project Azm.