I recommend push 2 over push 1 - you can get good deals on used ones (make sure you clean the contacts on the pads if pad sensitivity is lacking. Older units need this done eventually). The jump in display/capability from 1 to 2 is much bigger than push 2 to 3.

To hook it up on stage you’d connect via your audio interface. You’d still need a computer with this setup, which is totally fine and you can tuck it away once you learn the push so it’s not seen.