I got nothing for you on the technical side, but how does a 3/4 multi-sig, with you holding 2 of the keys, appeal to you. This way even if the other 2 keys are found and conspired against you (your ex-wife found the key at her home and got hold of your safety deposit key?), they can't spend the bitcoin, the most that could happen is the bitcoin would be frozen until something was worked out?