2 weeks of cupramine is fine as long as the fish is moved to a sterile tank. If you are sure that your tank is ich free, you should be good. It is always wise to observe for a few weeks to make sure there are no bacterial infections and what not.
What I would do, add your fish to QT, treat for flukes and observe while treating for flukes. After the fluke treatment, treat with copper for 2 weeks(must be at therapeutic levels for 2 weeks), then add to the DT. Hope this helps