This sounds like the original request Rearrange parts of note combined with already existing methods for block references/transclusions and copying/quoting.
and maybe (to come) WYSIWYG in order to see tranclusions and edit at the same time.
Reference: Inline Images in Editor (WYSIWYG Lite)
Edit: Applied to post above:
- above mentioned ‟definition list”/‟elements of the note” being the original blocks (e.g. with ‟
^block-id” attached). - ‟instances” being links in form ‟
[[#^block-id]]” - transcluded blocks optionally shown between lines of ‟source code” in edit mode for convenience to see them while editing as discussed in thread for ‟WYSIWYG Lite”.
- plus a plugin which moves ‟source line” into (hidden) ‟definition list”, assigns block-id and leaves ‟
[[#^block-id]]” in original place. - flattening works in some ‟bugs” now, so it can implemented as intentional too.
- Alternatively, footnotes could be used instead of block-references if they can be transcluded.