Best way to distribute bitcoin to heirs in a will I see on [bitaddress][1] you can generate a split wallet. That's where multiple parties have to each submit their "share" keys to generate the combined private key.

So the hard part, the math, has already been done.

But, I'd like a system that has the following advantages if possible:


No lawyers / legal contract required
No trust required among the heirs
If an heir dies after me but before the distribution, the surviving heirs can divide the inheritance equally
While I'm alive I can freely use my bitcoin, and move it around, without worrying very much or at all that my heirs won't be able to find it
My heirs can't see my private keys while I'm alive
Non-heirs can't ever see my private keys
My heirs can find what they need to get started after I'm gone, without too much trouble


It's probably going to have to be a combination of a physical safe, a physical key, and the online stuff and software. 

I'm willing to make the assumption that my heirs will know beforehand how to initiate the process with the physical key, and that they aren't going to take their inheritance early by force (e.g., breaking into my house). 

I'm also willing to use a dead man switch website. That might be like an email that I must respond to every month or else it emails all of them their keys / instructions. Note I don't know what that website might be.

Has anyone thought through a process? Even a different process that doesn't have all the advantages I'm looking for might give me ideas.
To meet your requirement of freely using your bitcoins and moving them around, a deterministic wallet such as Electrum may suit well. In that case, you'd just need to share the wallet seed (and some details on how to use it), perhaps with half of the seed stored in each of 2 secure facilities to protect against theft.

That doesn't meet some of the other requirements, such as handling an equal split, but writing a will could handle that part reasonably effectively (though still with some chance of human error or fraud).