Suggestions
I think learning
chado (or sado) would definitely help lessen your sense of loss. It would help to relieve stress and improve concentration for your work and channel your interest into something practical--I would choose ikebana, calligraphy, or kendo to do the same thing.
When my time comes (to go back home, that is), I hope to have learned the basics of some Japanese art so that I can continue practicing it at home. Maybe ikebana would be best because then I could create living reminders of my time Japan. Whatever it is, I hope to be forward looking rather than nostalgic. [Although this is easier said while I'm in Tokyo than back in the States.]
Other things that I would do are:
1. No shoes in the house--house slippers for everyone.
2. Use Japanese accents in decorating...hang a few framed ukiyoe or calligraphy around, or better yet a full folding silk screen. This where ikebana also helps. (Going totally Japanese would be too much, I think.)
3. Take furo style baths about once a week. If you have the space somewhere, I would install a hot tub. If not, do the best with your bathroom facilities, but soak in clean water.
4, Drink lots of green tea--it has vitamin C so its good for you.
5. Have occasional nabe parties.
6. Learn to make California roll sushi. Eat it with instant miso soup mixes.
7. Hang a wind chime on your terrace/balcony during summer.
8. Occasionaly watch some Japanese movie. Assemble a collection of Japanese movies--see "Best American Japanese Movies" in the Entertainment section.
9. Join the Japan-America Society for your State.
10. And most important, take up something new that's not related to Japan. I would try to learn Spanish guitar, blues piano, or sailing; but you should follow your own interests--maemuki ne (look forward).