This Module is currently available.
Dual stereo line in to modular level
ADDAC219IN was designed to replace bulky 1/4 inch jacks when plugging external stereo gear into the modular realm.
Using a 3.5mm TRS stereo jack input, the module splits the TRS stereo signal into 2 mono outputs (Left + Right) while also converting the line input to synth level.
There's 2 independent sections allowing for two stereo sources to be connected.
https://www.addacsystem.com/en/products/modules/addac200-series/addac219in
These merchants probably sell this module. Huh?
ADDAC System ADDAC219IN Stereo to Dual
ADDAC System ADDAC219IN Stereo > Dual