This Module is currently available.
Versatile Stereo VU & Mixer
The NOH-Modular Lavender is a stereo mixer with versatile inputs and outputs. There are four inputs with independent left / right channels, the left one normalizing to the right for mono compatibility. The fifth input can work as a stereo input or a mono input depending on the switch. Finally, the module has a stereo voltage indicator with tunable gain.
More info and availability-
These merchants probably sell this module. Huh?