Jean Paul Ertel Konzert für die Violine allein (1906)

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The following works of Ertel's are listed by Wikipedia:

Lieder ohne Worte Harmonium
Praeludium Harmonium
Technische Studien Berlin Koeppen 1898, 1902
Der Wallfahrt Harmonium Soprano String Quartet Berlin Koeppen 1901
3 Lieder Op.6 1902
Maria Stuart, sinfonische Dichtung
Pompeji, sinfonische Dichtung
Harald-Sinfonie
Der Mensch Symphonische Dichtung Op.9 Kahnt 1905
Balsazer Symphonische Dichtung Op.12 Rahter 1905
Hebraikon String Quartet Op.14 Kistner 1912
10 Schlichte Weisen Op 15 Berlin Virgil 1907
Die nächtliche Heerschau, sinfonische Dichtung Berlin Bote u Bock 1907
Violin Concerto Berlin Bote u Bock 1907
5 Lieder Op.18 Berlin Leuckart 1908
Passacaglia Op.19 organ Junne 1908
Hero u Leander Symphonische Dichtung Op.20 Junne 1908
Prelude u Doppelfuga organ Leuckart 1910
Suite violin piano Forberg 1910
4 Impressions de la Suisse piano Forberg 1913
8 Klavierstucke Op.28 1910
3 leichte Stucke violin piano Op.29 Vieweg 1910
Passacaglia organ Op.32 Copperath 1911
10 leichte kleine Stucke Op.36 Zimmermann 1911
Suite in alten Stil violin piano Op.38 Leuckart 1912
4 Mannerchore Op.41 Ertel 1927
Violin Sonata Op.50 Bote u Bock 1925

Presumably the Konzert für die Violine allein is the 1907 work described only as "Violin concerto".  The Hebraikon String Quartet (parts available on imslp) looks straightforwardly folky in character, although even here he shows a penchant for 4-note chords with the fourth finger extended! I believe I once played some of it through but can't have been very impressed.

Looking again at the Concerto, I think some of the chords would only be playable by using the same finger twice (i.e. altering the configuration of the hand mid-chord) and others by shifting position as the bow crosses the 4 strings. But that's only the first few bars! Clearly a sense of the player's struggle against near-insuperable difficulties would be an essential part of the listening experience. One for James Ehnes when he's got a few hours to spare?