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A UI might not make it easier
Building self-serve access to internal systems is generally a good idea. It would be silly to do engineering work to make a change when pressing buttons would do.
This situation tends to be handled either by working around the self-serve tools (perhaps doing sketchy things like changing values in the database by hand) or by taking the time to update the UI to support this particular use case. Another common pattern is an operation having very unexpected side effects (think along the lines of, you update a minor setting only to fnd out that doing so resulted in it emailing thousands of users). If there are sharp edges in the existing system that keep causing issues or deficiencies that keep having to be worked around, fix those (especially if everyone has given up on those problems being solved and considers them to be an intrinsic part of this kind of project).
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