Yes, DP, please shuttle this over to the Restoration forum. Might as well see if the regulars there have anything further. I won't worry about the flux thing. And thanks to everyone for your help so far. I will get the denatured alcohol as you have suggested, Bratwurst. And I have been as careful as possible with the light guide.
Unfortunately, I was also doing a case switch, and the replacement case came with the screen unattached. So when I put the screen on the case, it didn't sit well because of some rough patches left by the cutting with the Dremel tool. And then it fell off, useless. So I also have to smooth the case out where I cut it (by sanding?!? AAARGH) before putting on the extra replacement screen I had the foresight to order beforehand.
It just gets better.
This replacement case seems to be a tight fit for the screws, so I've had more than one screwhead strip out. Slotting a stripped screwhead with the Dremel while I was in the middle of taking the thing apart again was another high point in the experience.
On the bright side, I only had one bubble between the LCD and the AR film, caused by some random dust speck. Where the hell it came from? Aliens with transporter technology, no doubt. I used the air duster beforehand, and I sure didn't see it coming...
So it's actually been a week since the project stalled out, and I've been too traumatized to pick up with it again so far. It will probably require 2-3 beers before I'll be able to pick up a screwdriver again with a steady hand.
I'll bet that the second time it's a lot easier.