Available as an assembled Module and as a DIY project.
This Module is currently available.
Triple Attenuvert Bias Module
ACCESS provides users with attenuation/attenuversion and bias controls for three video signals. It may be used with a full color RGB set or with three separate luma/control voltages.
The top-most input is normalled to a 1 volt reference signal which allows the module to be used as a bipolar -1 volt to +1 volt control voltage when nothing is plugged into the inputs. All inputs are normalled as 1volt>R>G>B.
https://foxinghour.com/products/access-triple-attenuvert-bias-module
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These merchants probably sell this module. Huh?
Foxing Hour ACCESS - Triple Attenuvert
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