This looks great. Good choice of playable modules with immediate interfaces, and wise planning. I'd be curious why you chose Bloom and Surface over Marbles and Rings, I would argue that you might have more fun with Rings than Surface because of the external audio input. Especially since you already planning to work with external audio inputs in your system, Rings really allows you to explore the space between synthetic and acoustic sounds in a way that modules like Surface or Plonk cannot b/c they have no audio input. Rings is sometimes used for a no input, zero modulation 'YouTube potted plant' ambient sound which may or may not be what you're after, but it's important to note that is just one of hundreds of ways you could creatively use the module.
Also, I would recommend ditching the buffered mult and adding an Ornament and Crime (with Hemispheres firmware). I think you're doing a great choice of not having multifunction modules here, but uO_C's quantizers are really useful for generative because you can choose from dozens of scales and the interface is super clear and simple (unlike other multifunction modules which I've owned and sold because of the poor interface such as say, Disting, FX Aid, Peaks etc.). As a bonus you get many other fun generative tools such as clock skipper, clock divider, euclidian rhythms, chaos generators, burst generators, logic, sample and hold, rungler. In my experiences stackcables usually work fine to copy pitch cvs, but if not, you can use the quantizer to get the pitch back on track hence you really don't need a buffered multiple.
The obvious other recommendation is a Maths for envelopes, portamento, clock manipulation and attenuversion/mixing. Or if you want to start simpler you can get a smaller one channel slew limiter such as the After Later Audio Tilt and add an attenuversion/offset module (such as the WMD/SSF S.P.O. or the ALM O/A/X2). If you want to save space or money on mixing and attenuation you can start with a couple cheap passive 0HP mixers such as the BoredBrain Splix which work really well.