kleist, the only real impact the centric has on riding is, you are forced to ride with your knees out a bit. Oh, and your seat needs to be fairly low, as you can't pop off the seat when you stop. So you have to be able to put a foot on the ground while still sitting on the seat. But then, if you're starting up riding again, yourself, you're going to want a low seat, anyway.
The Rhode Gear requires a specific type of luggage rack, which comes with it. It's a standard rack. I don't think the Centric has specific requirements. I would buy it from a speciality bike shop, if you can, unless you or your partner is very mechnical. I think it's a bit of a bugger to fit.
Wherever your child sits on your bike, you have to adjust to them wiggling. I think this is more of a problem if you weigh 8 stone, iyswim. I'm a big girl, so it's not really caused me much trouble. Whatever your size, if your child is in front, you can at least see the wiggling, which helps.
Your DD might become more interested in biking if she sees you biking.
Did you used to ride a bike a lot? You do need to go out without a child on the bike at first, to get back in the habit, if you haven't been doing it lately.