You mean automatically, in addition to another move, or as a move option to the checkmated player? Currently the Diagram supports neither, but especially the latter is so similar to the Tamerlane II succession it already supports that it would be very easy to supply it as an option too. You would lose the possibility of any King rescue, though. And if you don't have that, I don't really see why you would prefer this over the already existing succession mechanism.
You mean automatically, in addition to another move, or as a move option to the checkmated player? Currently the Diagram supports neither, but especially the latter is so similar to the Tamerlane II succession it already supports that it would be very easy to supply it as an option too. You would lose the possibility of any King rescue, though. And if you don't have that, I don't really see why you would prefer this over the already existing succession mechanism.