Isn't this possible with the keystep?
If you're asking about a compact audio interface that would allow you to track into your computer while also give you additional MIDI ports, you really cannot do better imo than the SSL 2+ USB Audio Interface if you have a computer w/ USB-C ports. You only have 2 ins, but you've got a pair of SSL pre-amps, 2 headphone outs, MIDI I/O. It's just great.
edit: actually, looking for a sec, I'm pretty sure you don't need to have USB-C port on your computer, you can just use a converter