Like this?
https://bronzegears.blogspot.com/201...t-adapter.html
or this?
https://16incheswestofpeoria.wordpre...sports-tourer/
and here's the BF thread where I found both of those:
Huret dropout adapter dimensions?
Doing a Google search turns up a lot of "reverse" hits, where someone wants to mount a Huret Jubilee derailleur on a Campagnolo-style hanger. What you want is an adapter that makes a Huret derailleur hanger (with its stop at about 4 o'clock) look and work like a Campagnolo-style one (with stop at about 7 o'clock). The trick is fashioning something that's thin in the transverse (axle axis) dimension, but thick where it's making a new stop for the derailleur, and where it butts up against the Huret derailleur (either at the 4 o'clock stop, or at the "neck" where the hanger meets the dropout, further CCW).