Hello Mopar in Peru! Greetings from Mopar in Brasil! Yes this 4" bolt pattern is a pain sometimes.Very limited choice of wheels.The Dodges built here in Brasil are worse,they used an old Simca bolt pattern that matches nothing...
What we do here to swap to 4,5" pattern is to substitute the complete disc + hub front unit for some from other make like Ford.Sometimes even the bearings are similar.In the back we redrill the flanges and drums.Some guys prefer to go with right hand threads all around.
Now if your Duster is original it still has front drums.Then I guess you could redrill all 4.By the way I know of only one Duster in Brasil.It belongs to a friend here.It is a '70 model with a 318.