Get the micro-versions of the Mutable stuff and buy a Eurorack module capable of mixing your signals.
What's the relationship between those vendors and Mutable Instruments? I like Olivier Gillet's work and I like the idea of my dollars supporting MI.
But you'll want an envelope generator and a VCA to go with it.
If I am accumulating gear gradually, I can start out with overdubbing and use the Neutron's VCA and envelopes, I think.
Thanks again for your helpful responses.