Awesome so to regain access to the original mem card you will have to reinstall henkaku and enso on the spare card and install these two apps through vitashell
https://github.com/cnsldv/CardUnlock
https://github.com/theheroGAC/AppManager-Plus
Once you do that you're going to need to use app manager plus to move cardunlock app to ur0 you can also move vitashell to ur0 as well if you want, but what this does it it let's you run cardunlock from internal memory so they run even without a memory card.
Once that's done just turn off the vita, remove the spare card and then turn on the vita with no mem card inserted, run cardunlock and while running cardunlock insert the locked mem card and follow the instructions on the app, but make sure that whenever you get a dialog pop up you always select NO if you select yes you will format your card and have to start all over.