Sorry to see no one gave you any ideas.
I'm curious how the marineland plant led is going to do. The HC might not do so hot without high light. If you're looking for ground cover, I love me some staurogyne repens, doesn't quite require the high light. I'm just trying my hand at glossostigma elatinoides, but I hear it's good for low tech. Have you perused the low tech forum here for ideas?
How would you like this tank to look?
For the moment it is very sparsely and randomly planted... I might suggest planting the taller stems all together so they'll grow up behind/around the driftwood. So definitely the val and the sword in back as they are tall. I believe the nasea will also get quite tall, so it may be good in back unless you want to regularly trim it. The others may be ok where they are. I think some shorter plants that may be good in front of the wood are hygrophila compacta, I have found it easy to maintain and stays about 3-4 inches tall. There are other hygros that are good too, like araguaia. Some anubias would be good as well, they do well in low tech. Also, the easiest, hardiest plant I've ever had, water wisteria (hygrophila difformus). That thing does not die and in my tank grows probably 6 inches a week and has a nice spikey leaved look. Maybe some moss tied to the wood?
Sorry for the long paragraph, just kept having things come to mind.
Best of luck to you! Hopefully some others will chime in!
Edited: I almost forgot to say you should either DIY or invest in some root tabs since ECO doesn't supply nutrients to the plants. That and/or do some light fertilizer dosing. Otherwise, you're plants are going to be upset with you before long...