Amiga 1000 : switch between 50 and 60 Hz

[CLS2086]

Hi,
does anybody now a good trick that work in all case with all game than can run on Amiga 1000, in 60 Hz mode with a 50 Hz PAL Amiga ?
with A1200/CD/4000 it's easy with the Early kick.
On A500/A2000, it's possible with a modification.
But on the original Amiga ?  :-?   :-o