I'm not a senior member, so hopefully I'm not being presumptuous by trying to answer this. Hopefully I can help a little.
If you put the top part in a pot, I don't think it will grow roots, but it might grow a keiki.
My mom cut an old dendrobium cane into segments that were about 4 inches (10 cm) long and stuck them in pots. Both segments produced keikis, so it might be worth a try. Just try to keep the humidity up.
Anyone more experienced have a suggestion?