He participated in world premieres such as Bernd Alois Zimmermann's Die Soldaten in 1965, Haydn's Le pescatrici and Ján Cikker's Das Spiel von Liebe und Tod, and performed at major European opera houses.

He made guest appearances at renowned opera houses in Germany and Europe, such as with the company to the Netherlands in 1958, as Don Curzio in Mozart's Le nozze di Figaro and Scaramuccio in Ariadne auf Naxos by Richard Strauss.

He appeared as Jacquino in Beethoven's Fidelio in 1960 on a tour to Japan, repeating it at the Teatro Regio Turin and the Deutsche Oper Berlin.

He performed in the world premiere of Ján Cikker's Das Spiel von Liebe und Tod [cz] in 1979 and participated in Josef Tal's Die Versuchung (The Temptation) in 1976.

[2][4] Brokmeier appeared in television film adaptations of operettas, as Prinz Sternschnuppe in Paul Lincke's Frau Luna [de], as Richard in Leon Jessel's Schwarzwaldmädel,[5] and as Ottokar in Der Zigeunerbaron.

[6] In 1972, he made a guest appearance in Heinz Schenk's popular television music show Zum Blauen Bock [de].