yes, I'm not a fan of lattice either. lol. I may be able to make that.

I've used this polycarbonate roofing panel in a railing system before: https://www.homedepot.com/p/Suntuf-26-in-x-8-ft-Polycarbonate-Roofing-Panel-in-Clear-101697/100021329 It is hard to make out what's on the other side. You could also look at a double wall panel or frosted glass.

nah...

The problem is the deck is 4 feet off the ground. That would be a long wait for vines

Are you concerned with the look from the inside or from the outside? If you want a uniform look from deck to top of new railing, you could get a shade cloth panel sized to fit.

Just an opinion: I think that it would look better if your wood was softened a bit with color; maybe, stain. Try adding another element of the pipe rail somewhere else on your deck (if you have not already).

Add the same wood strips between the rods that are used above. Same stain etc.