It takes me about 5-10 minutes to swap from one seat to another - less time that it takes me to make sure the trailer is loaded before an event.
My arrangement bolts straight to the floor and gets me about as much headroom as possible, but it isn't abjustable in the slightest. In order to allow both you and your wife to use it, you'll have to mount it on sliders, and you're going to lose a large portion of your head clearance doing that.