Ithink your ideas are great. It's pretty much what I have done in the past.
I've had a lot of student t's, so there have been a lot of endings. Some were good, some not so good. Most involved a recap of our work together, each of us saying something to the other, sometimes a gift, then a goodbye. A few I regretted not saying what I had meant to, but one I was able to contact again before she left the clinic and I gave her a letter.