This is much clearer now, thanks.
Your 3-of-5 scenario, while certainly making it very difficult to steal the coins, also makes it too easy to inadvertently lose access to them. In many of your "loss of 2" situations you are depending on either a third party service (Gmail/FinalMessage) or a human's memory to recover your coins. Both of these are far from guaranteed.
There is also the important question as Loyce pointed out of where the seeds for all your hardware wallets are being stored, as these devices can fail.
Those are exactly my concerns as well. Going redundant, i.e. adding more dead-man-switch-services, payed for a year in advance might make it better, but still, not ideal. But where is the difference to a service like Casa Hodl and Unchained Capitals multi-sig-service? It's still a 3rd party...
Does anybody know of more dead-man-switch services?The seeds would be on paper with the hardware wallets in an envelope. I'm not too concerned about the seeds being encrypted, because if one location gets compromised, i.e. I realize the seal on the envelope has been broken, I have to create a new multi-sig-setup, rotating the compromised seed out.