Easybcd Portable ((link)) -

Add and remove boot entries: Effortlessly add new operating systems to your boot menu, including various versions of Windows, Linux, and macOS.BCD backup and repair: Create backups of your BCD store before making changes, and use repair tools to fix common boot errors.Boot from anything: Set up your system to boot from ISO images, virtual hard disks (VHD), or even network locations.Advanced settings: Fine-tune boot timeouts, rename menu entries, and configure default OS choices with just a few clicks.Support for UEFI and Legacy BIOS: While EasyBCD has some limitations with certain UEFI configurations due to Microsofts security restrictions, it remains a versatile tool for most hardware setups. How to create an EasyBCD Portable environment

Because EasyBCD stores all its necessary operational files within its own installation directory, you can create a portable version manually: easybcd portable