After sitting on this one for a while and doing some more research I've changed quite a few ideas and finally started to work on it.
To begin, I ended up not using the Tropica Aquarium Soil powder. I've never used it before and I use blasting sand in all of my other tanks but one. You can't really beat 50 lbs of substrate for 8$ and there is a Tractor Supply Store close by. Previously, I've used the fine grit BDBS which is very smooth and nice looking. However, it is prone to displacement by the outflow of HOB filters and sometimes seems to have trouble holding its form. This time I decided to go with the medium grit which I have to say I'm enjoying much more so far.
I bought 10 lbs worth of Ryuoh stone through a supplier, who has a great thread on this site, and used it in this first tank. No San Sui stone. That decision was never set in stone anyways (pun intended) as I just wanted something that looked nice.
I've also made a major adjustment to the plants. After putting both in my 55 gallon tank I believe that both the Sagittaria subulata and the Narrow Leaf Temple are much too large for a nano tank. They would quickly outgrow it.
Instead I'm awaiting an order for Anubias nana "petite" to place on the stone. Mini Dwarf Hairgrass for the foreground. Both Staurogyne Repens and "Mini" Alternanthera reineckii will help fill in the background.
I'm still hoping to get a pea puffer for the tank, but as of right now I have a few shrimp in there to take up space.
Adding the stone and sand to the tank: