I have yet to use a direct view LED system that hasn't maintained the 16:9 aspect ratio and either been 1080p or 4K resolution.

It will be 'viewable', but with 384*128 total resolution, it's going to be a pretty poor experience. The obvious 3:1 aspect ratio doesn't match up with anything on the face of the earth either.

The main reason to do something like this is because LED panels are INCREDIBLY bright. They are daylight viewable and they can really grab the eye of someone walking by.

This said, in such a small size. It will look like the cheap signs that high schools put out in front of their buildings. It's not professional, but functional, as long as it has a very specific purpose and direction.

There are 100 reasons not to use this as a reasonable system, but there are also a different set of 100 reasons why it may be completely appropriate for this specific setup.

From 4m-5m away (12-15 feet or so), this would be 7.5m wide for 1920 pixels of width. At 7.5m in width at 1920 pixels, an average person would need to be 11m away NOT to notice the individual pixel structure. This math works backwards to indicate that at least than half that distance, you would need to at least double the resolution to make the image usable. That means a 1.6mm pixel pitch would be the smallest I would go with from that viewing distance to have a image that appears 'HD'.

If the goal is a pixelated image, then they are ordering exactly the right thing.

I always jump on Planar's website for decent information on different panels...
https://www.planar.com/products/led-video-walls/

If indoors, you basically are using the same thing as their VVRI-3.9 model:
https://www.planar.com/products/led-video-walls/vvr/#!tab=specifications&spec=999-VVRI3.9

So here's my conundrum.

We only have a space for about 2mx1m of screen real estate.

They want HD quality, but they need it to be curved and suitable for outdoor use (so a moderate-high IP rating, 60s ish).

I'm having difficulty finding anything that fits the bill, other than going for some form of large TV (but that will reflect sunlight etc. like noone's business and probably won't be bright enough in daytime).

Have you come across anything that even closely resembles what I've been asked for?

I can scale and use some form of border to improve aspect ratio.

Cheers!