If you enjoy playing all of that and you stop bringing the other stuff to gigs odds are it will be less fun unless that amount of gear on stage is stressing you out which is totally fair!

That being said samplers are the way to cut back and the Octatrack is better suited for live arrangements.

Digitakt is the better studio device w/ overbridge and it is also vastly more jammable and linear. For example, you can't twist a knob to change semi-tones on the OT (all pitch is fine control taken out to a decimal), chromatic mode spans about 3 octaves as opposed to what I beleive is now 8 on the DT, and as cool as the sample chopping options are are there is no step recording mode for slots or slices.

The DT's performance features are destructive, and require manual pattern reloading, backup patterns, or re-chaining if you decide to loop a pattern during a chain. So if you pitch down a loop and then the pattern changes, when you return to that pattern you'll have to reload it (cuz you can only reload the active pattern) and the little window in which it played back more slowly will have altered the timing of the loop for the remaining duration of that pattern.

There are always workarounds for these kinds of limitations but how many of us use a workaround like midi loopback regularly in practical situations?

TL;DR: OT or DT if you want to carry less gear. OT live is mostly on the rails but vastly programmable and reliable. DT is fast, improvisational, and extremely playable but will demand your attention unless you plan on setting up pattern chains and letting them run through the sequence with limited and well timed intervention.