Well brother Grunff - your published advise to this point would indicates otherwise - I have yet to see a post from your node that I felt was heading in a wrong direction whereas I can point to several of mine that most certainly were..
While I don't know if it's possible in a SAAB (which is why I asked) or advisable for this situation - I've had a couple of seals done on another machine with the head on by bringing the piston in question to TDC - removing the spring and cap - then carefully removing and replacing the seal (dental tool helps greatly).. The procedure counts on doing it fast and making enough compression on the valve seats/rings to hold the valve in place..
However - I still am not sure that the seals aren't just half the problem for brother Evans (and this is where SAABs start to suck the joy of life out of you if you are not careful)..
A bank of cracked seals at the published mileage might indicate that the head has been (or is being) overheated - thusly - while I would spring for the leak down just to make sure, I think that the head gasket is almost certainly weeping and perhaps the head itself has been damaged (although less likely).. But - while I also think the water cooled turbo is a lot tougher than it's given credit for - all that steam could indeed be a squeaked turbo bearing/seal as well as the valve seals..
Unfortunately - there are almost endless possibilities on this one and why I was suggesting a good leak down test across the system(s)..
I have always felt heat was a sort of achilles heel for SAABs - they, like all good things and people nordic, seem to have very little engineered tolerance for excessive heat - which is fair enough - that little 2.0l is working very hard for the money.. Heck, I start flopping around the studio and making steam every time it gets above 80F around here myself.. :) ..
I wonder if they ever did an all aluminum block for special application when they still had a racing team?..