Look that the last upgrade was made in the 1998, and the previous one was from 1986, so that these last items are probably at the same technological level of an ANG F-16 block 25/30.
In reality those upgrades ended up to been even redundant: they spended a lot to integrate Aspide missiles and a modern radar (FIAR Setter R21G) only to discover that the latter limited range doesn’t allowed to take advantage of the excellent performance of the former.
We went to the absurd to lease some Tornado ADV for their big radars but still with Skyflash missiles only, so we ended up with a plane with a long range missile and a short range radar and another with a long range radar (when it worked) and (relatively) short range missiles.

Not one of the proposed upgrade you propose would improve in any way the Spillone’s performances a.t.c. they would probably spoil its several good points (and the F-104S got many of them) without resolving its own shortcomings (almost the remaining ones that were not resolved with introducing it at first, when compared to Americans and F-104G models).

J79-GE-19 engine was practically perfect for its flight pattern: blazing velocity and climb rate in scramble but so powerful even in mil mode to afford it a good cruise range and with such an acceleration that allowed it to regain velocity fast without using afterburner.