Looks like a similar stash to me except I had prefolds as my main stash over smart system ones.
I ve not tried or seen the smart nappies but think they re similar to prefolds?
If you re after more prefolds and If your not opposed to preloved might be worth putting a request in the wanted section for size 1 prefolds as loads of people have them. Just be wary of postage as they re heavy.
Have you got some nippas? I found I nippad my prefolds lots in the early days to contain bf poo and save the wraps from getting soiled.
When using flat nappies and wraps I d say the wraps are v important as they can be the first and last line of defence. I don t know what the smart ones are like, thirsties duo are my fav ( I see you have 1 on your list), I also used motherease rikki s, I think u get more value for money withe thirsties ones though as they last longer size wise.
I had a 7lb 2 DD and the old style bamboozle poppers fitted quite early on. They were so cute too! Just rem the bamboo will take longer to dry so you may need more cotton in your stash. Prefolds would be my option for cheapness, I used to fold the boy fold and put a fleece liner on top and put in my change bag like that ready , love the sleeve idea!
Good luck xx