Even though I know you can fix it up since you have a ton of experience, this sounds like the perfect opportunity to upgrade to a newer 9-5 if you have the ability. I personally think that the 9-5 is my favorite contemporary Saab just for how well they combine comfort and performance, the low price of entry is the cherry on top.
I say move on to a newer Aero if you can.
I say move on to a newer Aero if you can.