They are great cars.
Yes, you can do an IMS replacement and find a perfectly good bearing, like most are. We just did an IMS bearing replacement on a boxster and pulled out a good bearing. But the car's owner will sleep better at night now..
AOS is no that bad of a job, parts are cheap.
Plenty of them running around without issue.
Our 966 race car had over 100,000 miles on it when we converted it.
Cheers