I tell you, if you can be patient enough to go thru all that heating and stretching that seems like a pretty good way to get rid of unsightly scratches on interior plastic trim.I think vinyl would be tougher than the original rubberized finish but any place you are touching all the time wouldn't be a good place to use it obviously. Personally for the door handles I'd peel the rubber crap with alcohol and call it a day.
For the dash though it would be an ideal solution I think and the edges can wrap around the back and you'll never see them. Don't think of vinyl wrap as something you lay down flat and that's it. Think of shrinkwrap tubing, it works in a similar way, you can wrap just about anything in it.
Check this out. If you're impatient skip to 2:30
YouTube - Carbon Fiber Vinyl Wrapping w/ HEAT GUN (Complex Curves) by DECALFX.COM
I wonder what the durability of this product is against daily UV rays?