2-1-3-5-1-4-1-2-3-5-1-5 - The less repetitive a fingering is, the less likely you are to get locked or tripped up when intervals change.
lso, the 2-1-2-5-1-5 is going to get you in trouble when the passage introduces repeated notes, I can guarantee that. It's going to be a lot of extraneous motion.
If you have fairly small hands the 2-1-2-5-1-5 might be the only option though, unfortunately, although you still might think about introducing the 1-2-3 thumb-under.
Does it? How? 5 then 1 (or vice versa) transferring onto the note the 5 was on is a standard movement, something you see plenty in Debussy, Chopin, Liszt, Ravel etc etc.
123 thumb under just makes the situation harder imo. The shape of the LH changes as we constrain the thumb, unlike the repetitive open hand fingering pattern where the hand does not have to change its shape as dramatically and thus conserves energy for the more difficult acrobatics that come after the first two pages.
I think you'd be hard-pressed to find that in [insert your choice of composers]. That's what you'll be using if it's a two-handed figure, such as in Scarbo, but one-handed octave figures such as the Ce Qu'a vu le Vent d'Ouest is going to be a 1-4-1-5, unless you're like, some tiny-handed Asian girl. Check out Pollini's and Michelangeli's; there are videos. Also, probably even more appropriate, check out the LH fingerings in Vers la Flamme.
You're saying varying the fingering to include a thumb under is going to make it less tiring than using the same, three fingers for the entire piece? Really doubt it.
Anyway, I looked up a couple videos of this piece on youtube. You can find them for yourself. I checked Kissin's and Berezovsky's, both of whom do not use 2-1-2-5-1-5 throughout.
Berezovsky seems to be trading back and forth between mine and the 2-1-2-5-1-5 (even more mentally complicated), while Kissin seems to occasionally throw in a 1-2-3 instead of a 3-2-1. So, there are a couple more options there; seems like it's not exactly as set in stone as you might like to think.
Anyway, of course my fingering (or theirs) is more difficult. It's more difficult for the first 30 seconds. Yours is more difficult for the last 2 and a half minutes.