I have not read this thread past your first post. A couple of things that immediately spring to my mind are...
Just because your wifes driving gives you the shits does not mean she is a bad driver, she drives differently to you is all. She approaches some situations faster and avoids accidents, perhaps she has more confidence that you do, sees things quicker and judges distances better? Has she actually crashed the car?
Is your wife a lunatic, balls out, no limits kind of driver? Or is she a competent driver who wants to learn to ride a bike? Get her on a bike!
You should support her, encourage her to start riding. Make sure she learns the skills, ride slowly with her while she develops them. Make sure she has a really good, safe learners bike. Best thing you could ever do for your relationship, is to support her to start riding so she can join you on the road.
Only thing to be afraid of is she will show you up and be a better rider really

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