My sisters are fond of the saying "you do you." I think that applies in this instance. Tachibana-san is a very nice man and also classy, so I think he would appreciate a wine that matches those aspects. Probably a red, maybe a Pinot Grigio if I really thought about it. Then again that also depends on the food you'll be eating because not all wines will be suitable. I appreciate that you won't be taking advantage of him. I hope you have a good dinner.