You just adjust the bowling restrictons according to over to be...

You just adjust the bowling restrictons according to
over to be boweled.
Need to be made simpler so everyone knows the fairness.
Even if you work backwards from 50th over it could work.
I didn't watch the game but NZ were 68/1 after 11 overs.
Working backwards,they scored 333 from 39 overs.
The D/L system revised the target to 342 off 41 overs.
No different to calculating runs required starting from the
50th over backwards.

15 overs is needed for a result.
NZ were about 250 after 35 overs.
Working backwards from 401
the target is 152 from 15 overs.
No need for complicated DL system.