Ok that was easy!...but after some try :)

the concept :)



And now all the "Flow method" above can work! ;)


PS hum hum After reflexion my concept is not so good!
From View top curves result are not "Flat" ! So Flat them one by one is not a solution!
And even deform from the original!
I must rethink to that :)

> There is maybe an Array Dir then make a tricky selection for
> erase that don't wanted in one move!

<< Sorry I'm not understanding this part... But Array Dir is about replicating one object to make multiple repeated copies of it.

I can use the Array dir for replicate all the offset curves in one inclined direction
and maybe from a view i can select with just one selection box all curves
except one curve on the first group copyed, except 2 curves in the second group copyed etc...
for obtain that

Started with epicycloidal gear. Offset. MoveSliceToPoint and loft. Sweep point.