I am the wife and the bus that we want to get is my idea - BUT I can tell you how my husband got me into motorcycles:
He always makes sure that what ever bike he owns has every comfort for me. First bike had special custom ordered seat for me and he insisted that I have every peice of biker apparel to keep me warm and dry.
Lot of bikes between then and now. Current bike - and I hope the last - is a trike (he has some problems with the feelings in his legs so this is safer). My seat is heated, has cup holder, two compartments on either side of my seat for 'stuff'. Headphones in my helmet with volume control so I can listen to music. Plus he picked up a trailer cheap and painted it to match the trike so we can actually go grocery shopping with it.
It may sound extreme but he has gone to a lot of trouble to make sure I am comfortable, dry and warm on the bike so that makes me want to go with him more often. He still has to go to Daytona by himself though - too big of a crowd for me.
Does your wife like to read, drink wine, play on the computer? Are there comfortable places for her to do this on the bus? And the number one 'big item': is there a potty?