First of all, break a leg! It's a good cause, so I hope the whole show goes well, and raises lots of money.
Second, blimey, you have left it a bit late in the day to be trying to come up with material, especially if you are performing as a duo.
Is an ID going to be even remotely visible in these circumstances? What if a picture card is chosen (these are even harder to tell apart at distance than the spot cards)? Jumbo ID, perhaps? You can get the spectator to confirm it's the right card, of course, but I think you lose impact that way. Rikcy Jay does whole stage shows of card magic, so I suppose it's possible!
Can you get someone to film your close-up stuff and project it for the audience? This might be a bit of a pain, but could be easier than coming up with brand new stuff and having it ready for a two person performance in a week.
Do you do anything with sponges, silks, rope or jumbo cards?
I like the floating rose and t-shirts (especially done as a transposition). Is there any way you can perhaps think of a theme to tie things together, so it's not just you doing a few random tricks? It's really late to be trying to do that, I suppose, but Barry and Stuart's routine
http://www.youtube.com/watch?v=_Yw7oX5CXhk is in one sense just a few bits put together, but the overall story helps elevate the tricks into an act.
Oh, and one final thing - how long have you got on stage? That might help people with suggestions.