Wear tear is something you can't avoid. However, you may want to do what you yourself suggesting, e.g. gluing cracked areas up and then respray etc, or you can carbon fiber the whole dash. I've seen a mate of mine done it and it looks awesome. Go for the darker more subtle CF. That's one idea.
Good luck. However, I think the R33 Dash looks tough as...so don't go changing it too much.