Perhaps distracting yourself while doing the jump puzzle might help? Listen to an audiobook or watch youtube/tv/netflix/other streaming service on another device while you attempt it. At least for me I've successfully distracted myself from odd feelings of weightlessness when my character is falling off attempting the puzzle. Though it should be noted I don't have the phobia, nor a general fear of heights. Just watching my guy fall just triggers that feeling for some reason.

If that doesn't work I'd be willing to lend aid with the aforementioned "waifu warp" seeing as you're also on Coeurl. I'm determined to get to the top one of these days despite my less than ideal work schedule.