Bulk Publish changes to Planned Schedule

Summary:

Unable to publish changes to planned schedule in bulk

Content (please ensure you mask any confidential information):

We are bulk loading shift changes in published schedule for 50,000 employees over 1 year i.e. 52 weeks. We ran the Process Imported Shifts job, but the changes do not reflect until the schedule is published. The "Publish Planned Schedule" job is not available in Scheduled Processes list and has to be manually submitted from Time Management> Planned Schedule screen for each week. Is there any option to bulk load these schedules?

We have tried to setup HCM groups for 5000 employees each but the Planned Schedule page crashes and we arent able to publish schedules.