I have a Radian as a backup now. I keep it because 3 of my 4 kids could use it and it's nice for tight spots. DD doesn't need a backup since she can 5 step in most vehicles, and in an emergency type situation I'd have no problem with her in a seatbelt. I also need it for the front seat of DH's truck if we all need to take it somewhere. The Nauti works, but makes it hard for the driver because of the armrests.
OTOH, if it's a seat you can sell and get something out of, or even give to someone who needs it, then it would probably be fine to get rid of it. Being able to walk to the store if you need to is very helpful, as well as having so much family around. The only place I could walk is the feed store and that's down a 2 lane highway with a 55 mph speed limit and no sidewalks, so not safe. It would probably be safer to send DD on her horse.
Maybe you should just fold it and put it under the bed for a while. At least since it's a RN you can, right?