Oh, the Sleepy Nico is for front carries as well as back carries, most soft structured carriers are.
If you're worried about not being able to manage your baby's weight on your front, it really shouldn't be a problem with any of the specialist carriers. They are designed to allow for bigger babies.
The trouble with most of the mass-produced carriers is they only seem to be designed for little babies, up to six months or so.
Although they claim they will go to higher weights, I've found you can only do that by adjusting the carrier so the baby is hanging quite low - and that kills your back.
The specialist carriers allow you to keep the baby high and tight, which is much more comfortable.
My little boy, although younger, is a good bit heftier than your daughter, Norfolk Bumpkin, and I never have any back pain carrying him in the Sleepy Nico or my mei tais, because I can keep him high and tight.
I like the Apple design too, Aitch and Pinky, but I don't think there are any I don't like!