Steal Volo's Ersatz Eye from Volo or spawn it into the tutorial chest. Get See Invisibility without changing your appearance.
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Volo's Eye will spawn in Volo's trade table so you will be able to pickpocket him or buy it off him. Also spawns in the tutorial chest in case you don't have Volo at your camp. This spawns as a unique item, so it will spawn in either the tutorial chest or Volo's inventory, not both. You will only be able to get one, but, you will be able to reuse it on as many party members as you'd like.
Item appears as an eye shaped amulet with a colored background. To get the buff you'll just need to equip the amulet. You should be able to long rest and take off the amulet just fine and the buff should persist. The buff will be lost upon death, so make sure to keep the amulet somewhere safe. Your visuals shouldn't be changed at all.
I don't like eye horror so no idea how this interacts with the hags eye or the actual Volo's eye scene. I was able to lay down on the table after using the eye, so it doesn't seem to mark you as having had surgery. Mod works as I intended, but feel free to test any eye interactions and let me know how it goes!