I totally agree with the others - your daughter, your nappies, your choice.
Def pursue the cost of replacing the blueberry.
We used 2parters (tots bots & wraps) before DS PT'd
Worked really well.
They only had one other child in cloth when he started & that child had prefolds - nursery just said as long as you send them all made up its fine!
I personally didn't get on with prefolds with DS (but when I tried he was super tiny, less than 6lbs, and we were new to cloth & I discovered pretty's! But gonna give them ago again with DD now I know more & have more confidence.
I would recommend using 1 nappy system so not to confuse nursery - but a system that is reliable, even if not put on 100% right, as nursery staff are not as practiced at it as you are!