At a past job for a while we did Kanban with the sprint as a time box and it worked really well for the constraints we were working in. When we had work with deadlines, we'd flag that work as needing to be done in the sprint time box and put it on the top of the pile. Otherwise the team just kept picking up the next item, and we'd do a single review meeting at the end of the sprint to check in and see how everyone felt and what was accomplished. It was less of a retro and more of a temperature check.
It worked really well for a team that served a lot of different stakeholders and also had to field requests from customers since the priority of the work was always changing even if the deadlines for the work didn't.
It worked really well for a team that served a lot of different stakeholders and also had to field requests from customers since the priority of the work was always changing even if the deadlines for the work didn't.