Hi.
I use your tool for edit BCD also for my WinXP 64-bit modern OS
Best version is BootICE 1.3.3.2 x64 2015.02.16:
UEFI options work only on Windows Vista and newer:
I wrote tools for support UEFI NVRAM BootMenu from WinXP 64-bit:
https://forums.mydigitallife.net/threads/winxp-64-bit-on-a-modern-pc-iso-boot-wim-install-wim.88435/page-9#post-1910342
Maybe you could add editing UEFI BootMenu support via my SaveRt.efi + UefiVar.sys driver?