Inheritance Plan:

1. Hash your seed via Shamir Sharing Scheme
2. Place SSS Hash and instructions (with source code) on USB devices
3. Distribute USBs to trusted individuals (with individuals who do not know each other)
4. Tell friends that, upon request, you have to return the USB (e.g in the event you lose your keys and/or need to recycle new keys). If they do not, they will be banned from the inheritance
5. Create a deadman switch that will broadcast an email to seed holders to convene at your place of last known residence exactly 1 month from the message
6. Key holders who show up and can present their USB (and can prove the hash) will be eligible for equal parts of bitcoin

Happy to elaborate further on this setup.