I have found myself in a similar situation, but with my son, not my wife (she only rides pillion). I've thought about getting a second FJR, but have always resisted since some of the time I am going to want to ride the second bike, and after-all... variety IS the spice of life.
My solution was to get a V-strom DL1000. It is different enough to be fun for me and I can blast around on the dirt roads out in the country when I have a hankering. I have it setup with Givi side bags and trunk and a Russell daylong seat so that bike is all ready for long trip 2-up touring when need be. If I had a healthier bank account or excessive cash laying around like you do, that V-strom might be a Super Tenare or Ducati Multistrada. Either way, the lure of variety is far more enticing (to me) than having twin bikes.
My solution was to get a V-strom DL1000. It is different enough to be fun for me and I can blast around on the dirt roads out in the country when I have a hankering. I have it setup with Givi side bags and trunk and a Russell daylong seat so that bike is all ready for long trip 2-up touring when need be. If I had a healthier bank account or excessive cash laying around like you do, that V-strom might be a Super Tenare or Ducati Multistrada. Either way, the lure of variety is far more enticing (to me) than having twin bikes.