I don't know what edition you have, but this confusion stems from measure numbers. I don't have mm numbers. I counted from the beginning. Given the first measure is not complete, i counted from the first COMPLETE measure. Thus the fingering i give for measure 61 is the only really feasible one. Working back from the glissando which you say are mm. 73-74, the measure you are referring to is the previous one and is the third beat. Right? 3 5 4 5
1 2 1 2
Measure 62 is really not that difficult to warrent breaking up the last three thirds.
You know what? I've been playing this for some 40 years now and this is the first time i've noticed this little oversight of ravel. You're right. According to basic musical rules, in bar 72 the d-natural should change back to d-#. But it is an oversight and that's why you've never heard it that way. You should write to Durand et fils...
I don't see how your left hand would get in the way of that "scaly thing" going down. You take the high a with your left hand then alternate g-e-c-a with r.h, l.h, r.h, l.h changing the fingering in the last broken chord to 1-2-3-1-2.