Well, GEMA (and ISWC) actually spell(s) the title "Geh'n wie ein Aegypter"...
According to German grammer, left out vowels of infinitives are replaced by apostrophies. so "Geh'n" would be right. However, as you point out, speaking is a different thing and in that respect Die Ärzte's and lots of other German artists' lyrics and titles differ from official grammar.
Anyway, the those days members of Die Ärzte (likely intentionally) chose a spelling without ', so that's the one we stick to, no matter if grammatically incorrect or altered by any instances. Nobody would change Ägypter to Aegypter only because listed that way, either.
IMO, detailed excurses into grammer irregularites of titles in no matter which languages on work pages would be overshooting the mark.
David King : Being in charge of both work and first recording, what do you think?
Grüße aus Berlin