I haven't played this one, getting score... can your left hand reach a minor ninth? If so than no problem, arpeggiate & hold LH, take the first G with thumb, I don't see how RH span is relevant, it's just a chromatic scale-type thing, use your favorite chromatic fingering. No it's not... I'm at my computer keyboard reading... here is what I suggest for RH:
1212342312(3)12341234 etc... actually you should figure this part out for yourself, different hands have different preference for chromatic stuff, based on hand size and stuff. Just keep it legato. Good luck! Always harmless to experiment with the hard stuff.
...unless it's Rach 3...