Hi Lukas,
thank you! I've never found the third link and the results are fantastic. Using that code produces
with no compilation errors with as little code as
\version "2.22.0"
\relative c''{
\splayedStemChord
#'(0 -1.4 1.4 0)
#'(0 0 0 0 )
<e f! fis! e'>4 }
F.
But there are interesting snippets and postings for that:
https://lilypond.org/doc/v2.22/Documentation/snippets/chords.html#chords-displaying-complex-chords
https://lists.gnu.org/archive/html/lilypond-user/2012-07/msg00336.html
https://archiv.lilypondforum.de/index.php/topic,1176.msg6932.html#msg6932
In particular, Harm's coding in the third link (although marked for version 2.16.0) still compiles with 2.22
Lukas