There has been way to many articles that state Iraq will do the same as Turkey, Russia, Afghanistan and others that lopped.
They have stated that 1000 dinars will be converted to 1.
They have said that 20 trillion dinars will be turned into 15 billion dinars.
Those don’t fit your scenario.
They won’t replace it all at once. They will announce a lop, and they will issue a new currency, probably a 1, 5, 10, 25 and maybe a few different fils. The new currency and the old will both be valid during the exchange period. The old will have the same exchange rate as now .0008, the new will have a rate of .8.
Buy the end of the exchange period they will expect everyone to have converted to the new currency and the old will no longer be legal tender after the exchange is over.