Syria is poor country not sure how many western jets they can buy
They always needed help when procuring weapons. Russia provided them on credit. If the KSA is a strong ally they could help Syria acquire a lot more jets etc.
will the EAF be able to use the AIM-7 properly ? esp given the poor state of IFF intense low level dogfights in middle east conflicts ?
A problem with F-4s is that, in the OTL, the EAF found them too difficult to maintain. Btw when offered the F-5 in the late '70s or so, Sadat dismissed it as a "tenth rate airplane." He wanted F-15s and F-16s. So I don't think Egypt would've had F-5s in its inventory.