I suggest an Action.
If you have not used them before, they are simple, except for what you need to do there is a little cheat that you have to do.
The Actions can edit other records. The implication on the setup screen is that they need to be child records. That is just to make it KISS for regular.
The issue is that there seems to be no way to edit the record you are on. It lets you add a record or edit related records.
But "no problem". The child records are just defined by any report link field.
So make a report link field to define the set of records to be edited as simply the record you are sitting on. So on the right aside you have [Record ID#] and then on the left side navigate to the app and then the [Record ID#] field.
Then create an edit to edit the Record(s) ( well there will only been one) .
Note that the action will fire a nanosecond after the record is saved and re-displays, so you may have to F5 refresh the screen to see the effect of the Action.
This will also work for Grid edit too.