Custom XML File Creation & SharePoint Sync

I'm in need of a PowerShell expert to help me create a custom XML file. This file should have taskbar items for commonly used applications: Outlook, Word, Chrome, Excel, and Teams. Additionally, this XML should also sync SharePoint files that the user has permission to access to their profile. However, there's a unique twist - the sync should occur only on a "files on demand" basis. This is to avoid downloading large folders.

Key requirements:
- Development of a custom XML file or powershell script
- Integration of the taskbar items for specified applications
- Automatically sync SharePoint files to user's profile
- Sync to occur only when user accesses Windows Explorer

Ideal Skills & Experience:
- Proficiency in PowerShell scripting
- Prior experience with XML file creation & customization
- Familiarity with SharePoint synchronization
- Understanding of Windows Explorer's behavior and its trigger points
- Ability to ensure secure file access and sync operations.