I think it would look great with a solid glosso foreground and where the smaller Erios are at running back to put the UG there. I'm sure that's not waht your after but that is what I see.
I have a red lower growing Hygro that would work well contrasted with the UG in the rear. I'll move the UG to the far side, replacing the Crypt parva
I need to reslope that UG spot anyways.
The R wallichii would match well in the front row since it's got another green fine needle plant, the Erio "giant". Likely move that where the L granulosus is, then move that plant in that row next to the Erio row.
I'm still undecided about what to replace the UG with.
Elatine triandra would be nice.
I have not grown that weed in about 7 years now.
It has a different growth form and is a nice brighter green, but it grows fast, well, so do many in this tank.
Question is, can it be managed somewhat easily like most of these.