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A better idea: get an adder module. These look like 2-4 hp mults, but what they actually do is to add two signals together. So you could send the signal and an offset voltage into one and get the composite signal you're looking for. Also, another mixer that you might have a look at is Erogenous Tones' LEVIT8, which can either be configured as an eight channel mixer/attenuator or two four-in mixers. To use this in that 8x1 configuration, you'd want to first route one signal each through something like this: https://www.modulargrid.net/e/shakmat-modular-sumdif to put offsets on. At that point, you'd have a pair of adders with that Shakmat module, so if you also wanted to use the 2x4 config, that would be similarly doable. And if there's nothing you can use for the offset source, put one of these in: https://www.modulargrid.net/e/2hp-dc and there you go!