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You can just patch your attenuated LFO right into the VCO 1 CV input. The LFO will be added to the sequence, but only VCO1 will drift. So if the SEQ PITCH MOD is switched to VCO 1&2 you'll get a nice detune effect between both VCOs.
If you mult the LFO into VCO 2 CV, too, both VCOs will pitch drift together (mult with e.g. a multiple module or a stackcable).
Mind that the LFO should be attenuated VERY much. Typical LFOs swing between -5 and +5V which means 10 octaves in V/Oct terms. So the drift might be way too drastic. In my experiment I did to verify this concept the attenuator is open just a hair - literally. So you might be better off with two attenuators in a row to have more wiggle room for fine tuning ;-)
Cheers