-snip-
Touching descriptors and scripts to make a DIY dead man's switch is really dangerous if you don't know what you're doing. It can cause a total loss of funds in dramatic Wile E. Coyote fashion.
Yes, this is why it's recommended to test the setup before actually using it.
That's all I can add because I've already included the issue of that setup in that quoted message.
Perhaps, it'll more viable the future when clients/wallets make it easy to import or create such script.
For now, the closest is coinb(
dot)in's bare-minimum implementation of OP_CLTV. (
only one pubKey and a locktime)