What are my options for rescaling a twisted/angled blade?

Try fettling the scales to fit. Don't try bending the blade, it will shatter as the steel is very hard but brittle. My best advice would be that if it's warped bin it. There are plenty of good razors out there going cheap!
 
Updated to say that the peening part went well, the washer inside seemed to make it all work but instead of stopping when I should I carried on too far and ended up splitting the scale across the pivot hole. I have ordered a cheap pair of plastic scales to have another go and if that works reasonably well I plan to make my own from a blank of wood.

Mark