I'm suddenly not too sure on the alchemy pick if these are one-offs aslthough it still makes a great deal of sense to get the map, as we're likely to get other unlocks that are good in the future so I don't feel that we're going to be too limited in choice honestly. My favorite one is still the map though, maybe something else will come of it too given he's friends with Dumbledore.
[X] An old Idea of a Map – You had the idea of creating a Map of Hogwarts to track the hidden secrets you uncovered and reveal the people that move on its ground. With a mind as great as Nicolas, you can try to start this project earlier than you had planned out. (Lower the DC from 400 to 100.)
[X] Avifors (Deep Understanding) – Transfiguration. A transforming spell that could be used to change the target into a bird, flock of birds or occasionally a flock of bats with a vivid flash of blue light. Transforms the targeted object into a bird, which can then be used to carry a small object or message to someone. With the deep understand you have gained, it is possible for you to guide the birds with new orders, even after having cast the spell.
I've been convinced on the Avifors though, as I was originally just gonna go for Reparo. The unique capability that understanding this spell gives us is pretty great, as it's overall fantastic even for duels of our levels as you can do more complex maneuvers with the creations so instead of just attacking in a simple manner they can attack from behind/sides/above or just distract the person with noise ect, they can intercept spells in canon too which is invaluable particularly when spells start getting more dangerous, and there is interesting capability in their non violent uses. In the description you get given they can deliver items or messages which can be valuable on it's own, but there are perhaps other specialties say if you create crows or ravens which are highly intelligent creatures (even before any potential magical intelligence buffs ala Owls (which are quite dumb in nature) or Kneazles for example) that may be able to perform independent tasks or find things for us. The number of creatures it could create has a great deal of potential given the wide variety of animals with different capabilities within the avian family, particularly if you can branch further out like how it describes bats being possible, and we know magic can effect things differently for example humans/house elves and how Owls can find things.