I'll echo Snail's comment, a mother 32 would allow you to dabble, you can certainly use your Sub 37 to play a modular live for monophonic lead lines, but you'll have to use module like 4ms PEG or QPLFO for triggered modulation.

Can the Sub37 output CV from the sequencer? or is it just from the keyboard.

Any of the semi modulars that are out at the moment like the mother 32 or oCoast will allow you to test the waters.
Tight intigration with a fix path synth is difficult, but layering a sequenced bed of modular mayhem under and expressive mono synth is most *people's idea of heaven.

*people who frequent modular grid, muffwiggler etc.