This is great news. I would try to get Porter 15-20 plays in the dime this week. Allow him to get his football legs back. Then, going foward you can mix and match with he and Carter/Harris. I think Porter is probably most useful on the outside, so you may have him play the outside in the dime, with the other two guys matching up inside. Then, take him out of the line up in normal to nickle situations.
As for Kuper....that great news!!! But I would not rush him back. Give him another week to rehab...and be careful about bringing him back before he's 100%. We need him for a Playoff run and beyond. Bringing him back too quickly would be stupid...with Ramirez holding his own. - My opinion.