Same situation here: family, dayjob, lot‘s of stuff to do and almost no time for music…
I found a combination of an iPad and an OP-Z to be quite productive. It‘s only four items: The iPad, the OP-Z, camera connection kit to connect the two and headphones.
The iPad is running MiRack, an iOS-version of VCV-Rack. Having all the possibilities of modular is a bit overwhelming first. My solution was to build a very basic patch first, just to have more synth capabilities for the OP-Z, the I gradually extended it.
There‘s a few examples on the results in the improvised techno thread:
Maybe not the most brilliant stuff, but I definitely have fun. And the setup is completely mobile (battery powered and lightweight).