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Hello and welcome, fuzzylogic.
As far as a functional modular system goes, you are missing almost everything important. Without utilities, VCAs, LFOs, envelopes, a sequencer, etc., your oscillator will just make a single tone that you can tweak by hand. A single (huge) oscillator in isolation will not add anything to your setup. What you seem to want are modulation sources for the Morphagene.
Can you give us a little more detail about the sounds you are hoping to synthesize from your rack? As you mention, you have plenty of effects for your vocals, so what do you envision a small eurorack synth to add to your setup?
Have fun and good luck!