I think that the Germans could have ended up using the F-16, but not as a Tornado replacement.
Slightly increase Northrup's pace of development/US political will for developing the F-5A/B Freedom Fighter, while at the same time reveal the Lockheed F-104 bribery before the sale is finalized; resulting in the West Germans refusing the F-104 and ending up buying the F-5.
With the F-5 being better than the F-104, the West Germans will be able to wait somewhat longer to replace them in the fighter role (especially if they retrofit some of their F-5As to be closer to the F-5E), speed F-16 development somewhat and they might end up choosing the Fighting Falcon instead of the Phantom II as a fighter, while still developing the Tornado for strike capabilities.