We do a "ScrumBan" style. Basically we do backlog grooming, sprint planning with 2 week sprints. We factor in that the oncall engineer will likely have less velocity that sprint and we're ok with carry over of some tickets (try to minimize this as much as possible).
If you're having issues with your work fitting into a sprint, have you dug into why? Are you breaking down the task into small enough units that make them more digestable in a sprints worth of time?
We also punted on standups, I never found them to be valuable and past experiences felt like they were more of a mechanism to get people into the office at a certain time. We do a once a week team meeting with an agenda that you can add to before hand. We discuss anything that needs to be discussed as a team and unblock anyone then. I trust everyone is doing work daily and I can check our sprint board without having everyone tell me what they worked on daily.
It took me calling them out in a tweet to get myself off these calls. The only place I used my phone number was for two factor auth, which they then decided they would use to up sell me. There's also no way to opt out on their website. Very shady practice but love the product otherwise