Hello, This question was in fact answered by the debian-kernel mailing list, who informed me that the documentation was probably wrong. The kernel does actually support merging volumes, just the 'dmsetup targets' output only refers to output from modules that are already loaded, not what is supported. Using 'lvconvert --merge' works without problems.
This is the original thread: https://lists.debian.org/debian-kernel/2016/05/msg00186.html. Thanks! Tom
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