Their EFs were one of 1st series and are basically not compatible with any other EF, they have no A-G ordnance and are maintenance nightmare.
This. And also the airframes af Tranche 1 are said to be less durable than later production, because they had not yet perfected manufacture of the fiber materials. And as Tranche 1 Austria is in the same situation as with they used to be with the Draken as the only user. There is a project planned for a unified computersystem across EuFi versions, but that would cost a lot more to install on tranche 1 than later production.
And a two jet aeroplane for what is basically an airborne border patrol car in the end (as Austria does not use its planes for anything else) is a bit much with double the engine maintenance costs comapred to a single engine type. Makes you wonder who has been greased.
Or they could finally buy some sidewinders for their Saab 105OE.
But the 105 are sub-sonic and they want a super sonic plane.
Heck for their purposes an overhaueled and modernized MiG-21 would be sufficient.
More serious options are Saab JAS 39 (that was turned down last time) or the Gripen NG, lightly used F-16, maybe something from PRC? Austria is neutral after all. hmmm Korean T-50 could do the job. The market offerings for value jet fighters are not so many it seems.