Nah, not gonna test you, AB. Not yet, anyway.
The exercises I listed work all the same muscles their pelvic floor exercise will. Don't bother with theirs. The "big three" I suggested are from Stuart McGill, an authority on lower backs. I'd do the curlup, followed by the side bridge, and finally the birddog.
Yes, there's a reason for the birddog over the superman, and you're right about how it's done. It's on the knees, one arm and opposite leg lifted, no hiking the hip, etc. The birddog has the same effect (though takes longer, 'cause you gotta do both sides seperately) but puts much less in way of compressive force on the spine. Hellish forces, in fact. Better to be safe than sorry.
I will say this, though - I did sky-divers (another name for the supermen

) in the past and didn't feel any problems with 'em. Could be 'cause my problem isn't so bad, or 'cause I didn't do 'em long enough. I'd play it safe and try birddogs, but it's up to you.
McKenzie/Cobra pushups are great too. You do a pushup with your pelvis against the floor, looking straight ahead. You raise to the top, pause, let your lower back sag lightly, then slowly lower. Works great for relieving back pains. Throw these in if you want.
Don't stretch prior to a workout anyway. Ride the stationary bike, and maybe throw in some calisthenics. Quick warmup in five minutes. Stretch after, mainly the important muscles (postural-related and back related). Warmups - just make 'em more cardio like by going through 'em a little quicker by cutting rest times, if you can. Good for warming up at the same time, anyway. I agree with Rippetoe on squats being great for a total body warmup. Bodyweight squats would work just as well.
8 sets of 8 secs? I guess you meant 8 reps of 8 secs, but whatever.

Just don't wanna get lost here, thinking you're gonna do 8x8 - for 8 seconds each. I wouldn't do all those. Do the following:
Curlups - 5 reps @ 5 seconds each - work up to 10 reps @ 8 seconds each
Side Bridges - same as above
Birddogs - same as above
Just saw you mentioned the rower - that should work just fine, up to you. Just don't let the back round at all, pull the shoulder blades together, keep upright, etc. Or do what I suggested.
Forget hypers and reverse hypers. Do the other stuff. No reason to throw in all that crap, it'll be too much. Also, do the core stuff after your lifting.
Increased frequency for chins will be fine, as long as it doesn't adversely impact your recovery, which it shouldn't.
Incline bench at 30 degrees will be fine. Good choice.
Honestly, the routine isn't that bastardized. For athleticism it might suck, but for general health, strength and size, it should be fine. You've got the squats (though less effective, still good to maintain), bench, incline bench (your OHP shouldn't suffer too greatly, but it will need some work), rows (honestly, the support only takes the lower back out of the movement, which can be used both dynamically or statically - and this gets worked in other ways. The muscles that need to be worked will still be worked. CCJ does 'em supported, and I don't think he's got a problem.

), and chins.
Honestly, I like the routine as it is. Deadlifts are missing (big deal), and you can't OHP. Oh well. Could be much worse.
