Split Sprint / Insert new Sprint

As a project admin I would like to be able to "split" an existing sprint on the planning board into multiple sprints to save time and effort when rescheduling lots of tickets.
Or in other words: I would like to be able to insert a new sprint in between two existing (planned) sprints.

At the moment we have quite a few sprints already planned for the future (sometimes > 10), but they are constantly refined up until the moment when we start the actual sprint. This leads to situations where we need to do some major re-prioritization or reshuffling of tickets.
Right now we can only manually achieve this by adding a new sprint at the end of the planning board, dragging all items from the previously last sprint to the newly created sprint, and then move the tickets from prior sprints one sprint down respectively. Also we need to manually update the names of all previously scheduled sprints accordingly.
In order to save time it would be great if we could automate this task by inserting new sprints in the middle or splitting existing sprints.