How can I use an MST split screen (Dell UP2414Q) as a single screen on Linux and Wayland?

I'm trying to use a Dell UP2414Q screen on Linux. This is a 24" 4K display. Because it's an early use of 4K technology, the screen uses multi stream transport (MST) over the Displayport cable, and internally represents the monitor as two separate 1920x2160 screens lined up horizontally. In 2014, this appears to have been the best way to achieve the required bandwidth to drive a 4K resolution. On the distro I'm using (Univeral Blue Aurora / KDE), the screen is unfortunately detected as two separate displays. This means that each horizontal half of the screen is used as its own display, and I can't extend apps or the Plasma taskbar over the two screens. Is there a way to use this screen to its full potential on a Linux desktop using Wayland? I've heard various measures of success using an X11 feature like Xinerama, but it seems clunky and I'd prefer using a Wayland desktop anyway.