Here is an idea. Before the players enter the game set a custom spawn location for them (I can give you the command if needed). Make it so everytime they enter that room a death message is presented after the beginning of the game. and then teleport them out of that room back into your map.
The downside of this is it might be tricky to be like
how do I create custom death messages in Mcbe and how do I tell it when to say it?
I have a few ideas few questions first.
Do you drop items when you die?
Do you have any cases where someone falls to their death?
Do you have any death detection methods in place? or is there anything currently in place detecting a player's death?
All nos
So you have the gamerule on to keep inventory?
Here is an idea. Before the players enter the game set a custom spawn location for them (I can give you the command if needed). Make it so everytime they enter that room a death message is presented after the beginning of the game. and then teleport them out of that room back into your map.
The downside of this is it might be tricky to be like
"Player X murked Player Y"
But you could at least do
"Player X was murked down"