You can set the Digitakt to talk to itself via midi. Essentially you’re creating a pattern chain via midi program change sends. No footswitch needed. Though a start stop switch might be helpful if you’re gonna have both hands on the Bass. Any solution requires a bit of planning but not necessarily a chunk of cash.
Edit: I’d read the linked thread and see if that works for you. I plan on spending more time this weekend doing the same thing. And if the Digitakt could send midi to itself internally that would be fantastic.