[Suggestion] Treat mid-mission objectives as checkpoints and allow reverting back to them instead of starting mission from scratch

Like the long-winded title says, would it be possible in missions where there are mid-mission objectives to create some sort of system which works similar to the pre-battle and end of turn autosave system and in the event of things going horribly pear-shaped, allow you to go back to the previous "checkpoint" instead of having to start the mission over again?

I may or may not be specifically referring to the mission The Chalice of Entropy in the Chaos campaign... 😐

That was a harsh one tried it ten times.

But yeah this would be lovely, if it is possible.