The way the axle mount daul hubs are designed you just need the end of the axle to be just past the outside of the inside tire or even with the outside of the tire and there will be enough axle for the duals to mount. You can have the inner rim on either rib to achieve this. Only takes about 8 inches of axle to get the hub on.
Now if you are on 38 inch rows for planting that should be about the width you need for plowing as well.
We ran axle duals on many IH tractors and never moved the inner wheel around for plowing with a 5-16s plow or planting when on 38 inch rows.
You may want to move the hitch on the plow rather than moving tires in and out.