The kind words of wisdom are just what I needed to hear to be honest, Chesherca. Thank you.
I think I became so upset as I had the shrimp in temporary accomodation (in a tuppaware box floating in Kaze's heated tank! I did daily water changes) and they were absolutely fine - the females became berried. I've been so cautious over adding things to the planted tank because I was trying to make sure the soil had established and that the filter was ok (I love sponge filters; so do baby MTS apparently, they were burrowing into the foam). I have a habit of overthinking things..
I picked myself up after a rest this morning and decided I'd re-do Kaze's soon-to-be new home with the live plants and sand. I've rearranged things in an aquarium slightly smaller than his previous "soon-to-be home" but it's made from a beautiful blue-acrylic (so it's crystal clear) and an interesting shape (it's slightly bow-fronted). I don't usually like acrylic tanks for fish but this one has a nice footprint that I think Kaze will appreciate. Also have a smaller copy for the frog. Just put the MTS in it and they're very happy that there is only sand and no more soil dirtying up their shells!
I saved as many baby MTS as I could (they reproduced!) as well as a pair of ramshorn snails, so hopefully these guys will help me keep the aquarium in good fettle for Kaze.
The bit of driftwood I had in the old tank is also in the new one; it drifts off into the back and fades away - looks like a staircase! Overall I'm happier with how things turned out and can't wait to see how it looks when it grows out. I just hope the little shrimp forgive me for letting them down (... is that a little excessive? Haha).
As for the frogs, I'm definately still going to get one. Once Kaze is in his new home and I can monitor how the plants grow in just sand I'll look into it further. There are plenty of aquatics stores around my area and I'm sure one of them must have an ADF - I can always order one in.
Things always seem worse last thing at night and first thing in the morning! Haha. Now I think I'll settle with a nice cup of tea and watch the snails ramble around their new home. They seem to approve.
(Sorry for slightly derailing the topic there and thank you also for the links!)