This seems like a fine idea, though it feels like the distinction between these moves and Hx is pretty small if you are doing them all at once, prior to the First Session. They seem to mostly exist in a weird middle-ground between Hx and an immediate situation (such as those produced by regular beginning-of-session moves and, I would say, most Love Letters) which could be neat or could just be awkward, hard to say.
I would definitely be wary of phrasing and framing these in a way that implies things about the Apocalypse that would normally be discovered as part of the First Session. For example, the Brainer move suggests something concrete about people's experience of the Maelstrom (they can 'enter into it'; it's a place), which is likely to have a significant influence on how players answer when you start asking them what it's like when they Open Their Brain, etc. This seems particularly worrisome because the Brainer is the most likely to be influenced by this phrasing, and in most games the Brainer also in turn has the most influence over the group's conception of the Maelstrom. If this is a purposeful MC call -- you really want people 'going into' the Maelstrom to be a thing in your apocalypse -- then that seems legit, but if it's accidental then you might want to consider a more neutral phrasing.
As a broader example, you constantly refer to lower-case 'hardholders' and 'savvyheads', even though the book is actually quite explicit that there is only one Savvyhead, and only one Hardholder. It's obviously enormously tempting to use the playbooks as a sort of 'social role shorthand' for describing NPCs, but it's also kind of lazy, and misses an opportunity to be more specific and evocative. If the assumption here is that the moves are referring to the actual other PCs who have those playbooks, then that should probably be more explicit -- and I think you're still better off simply describing the type of person, and then pointing out to players that the person in question could easily be one of the other PCs. In any case, the current phrasing suggests to the players that they are in a D&D-like world of classes-as-demographics, where they are just one Fighter among many, which is precisely not how the Apocalypse works.
The structure of the moves is extremely generic, which I get is on purpose but which to me seems pretty boring and (again) makes these seem less like love letters and more like an extended variation on Hx (now with NPCs.) It's also weird that the structure of the move implies the options are all negative, and therefore to be avoided, but in fact most of the situations are if-not-benign then just kind of everyday-Apocalypsy. I.e. if I am a player, a 10+ really doesn't seem particularly better than a 7-9, and the only problem with a miss is that it's the MC who is picking, so she might not pick the situations I think are coolest.
It's possible that the generic, soft-serve approach is the right one for the situation you described -- new players, trying to ease them into making contributions -- but I think you should consider just picking one of the situations on each list and then writing a more specific, more gripping move around that situation, which creates both a more immediate situation and a more meaningful choice for the player (as a bonus this will model how moves work in the game better; it sounds like in many situations this will be the very first move the player ever rolls for, after all.)
For example, on the Angel list, I would just take the first option -- Your most recent NPC patient has a life changing injury or condition and you can't help them -- and expand that into a move like:
Your most recent patient has a horrible, life-changing injury or condition, and you don't know how to treat it. Roll +sharp. On a 10+, choose 2, and take +1 forward on trying to do something about it. On a 7-9 just choose 2:
* They are part of a violent gang, and the gang expects you to fix it.
* It's infectious.
* It has something to do with the psychic maelstrom.
* They have essential skills or knowledge that the community cannot do without.
* They're related to you, by blood or by sex.
* It's going to kill them, but not just yet.
On a miss, choose 1. The MC will choose some others, but you don't know about them yet.
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Anyways, just my thoughts. It seems like an okay idea, and my general bias against indiscriminately-applied Love Letters may just be showing through.