Reading this got me thinking, I wonder if it would be possible to set up a smart contract to transfer all of your funds into a wallet that she controls after a certain timeout (say a year) unless explicitly stopped by you. Kind of like a failsafe. So that once a year you cancel the transaction before it happens, but if you pop your clogs, it goes through
That's a really nice and interesting. Also, I believe for a small fee there are banking services that holds your belongings in a safe coffer, there in the event of your death, they can open the coffer and give your wife whatever was stored in there, including all your passwords and crucial information. These services are generally well spoken, as they hold no value for bandits and are secured 24 hours / day, I believe you can even check the security cameras yourself.
I believe your wife won't be interesting on keeping investing like you (unless shes into that) and she is going to cash out.