Bentzon and Langgaard- well, people may have a go and especially with Langgaard I'll be curious to hear. I have Bentzon 2 (for piano and orchestra, opus 36, 1945) (Dreier/North Schleswig SO, piano soloist unidentified?) and 6 (Piccola, 1950, opus 66) (Jens Schrøder/Aalborg city orchestra) (dates of broadcast and movement headings on both unknown, help welcome) in what are almost definitely broadcast (i.e. not commercial) recordings, actually... hrm..
(At least symphonies 3, 4, 5, 7, and 8 have appeared on CD I see.)