I have dealt with these kinds of impromptu scheduling change requirements from the business units for years. Without a central scheduling system like Redwood, I found that the best way to deal with these kinds of requirements was the simplest way. Create a special job or jobs. It's tedious, but less error prone.
- If a job doesn't conform to a hourly frequency, then look at creating a series of daily jobs.
- If a job doesn't conform to a daily frequency, then look at creating a series of weekly jobs.
Good luck.