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Just updating this in light of a discovery I just made. It seems at some point, manage-bde became available in default WinPE images. A while back, it threw an error message caused by some packages not being included in the default WIM file, the fix for which was some manual work to generate a custom Boot.wim, but I've just tested Win10 1607, Win8.1, and even a "Win7 with June 2016 Convenience Update" official ISO, and the all of their WinPE environments now have a fully functional manage-bde command. It also works with my Reflect Rescue Media created with the latest release of V6 based on Win10 1607. This isn't QUITE as convenient as having a full GUI interface for unlocking disks would be, but it's all I need since I'm quite comfortable with CLIs and I can now unlock BitLocker disks using either a Recovery Key or (in the case of BitLocker To Go disks where my backups might be stored) a password, rather than having to grab BEK files and store them on a flash drive beforehand.
Macrium, even if you don't end up implementing a GUI for unlocking BitLocker disks using Recovery Keys or passwords, the availability of manage-bde might be helpful to note in the KB article you already have for supporting BitLocker in the Rescue environment. The icing on the cake is that manage-bde actually has very comprehensive help documentation if you add "-?" to the end of a command that you're still working on in order to determine the syntax of whatever needs to come next.