I'm looking forward to reading the whole thing!
It's sweet that Tom would want Jade to play his wife, and why not? Movie make-up can turn most anyone into what you need... Look at Tom and Jason Isaacs...Bleach blonde Malfoys by day, Gorgeous Brunettes by night.
It could work, just please keep the gladiator boot/sandal/heels she loves to wear off of Mrs Draco Malfoy!