Yeah someone kept telling me to use Blood Magic to make them but, frankly, I watched JadedCat's youtube video on it.. its hard to follow and learn a completely new mod from scratch when the person is just creative-mode-ing everything in and verbally explaining what they do, instead of showing you the process (no offense, but some people just dont learn by audio explanations, and Im one of those people). Even your breakdown seems simple and easy to follow.
I was lucky and two other players (who had mobs spawn on theirs.. but then later done blood magic) on the server came to help (knowing this same situation happened last time, only.. then we could craft them using feathers and such..). They had done enough blood magic together to make them - but that seems to not be quite right in the quest book for Agrarian Skies. You have to pretty much go out on a limb and explore a totally different mod, in a completely different manner than the book itself states, just the progress with what seems like a pretty early requirement?
IIRC, there is a quest where you have to create some spawn eggs in "Learning to Skyblock". You need Blood Magic for one of them, and NEI will show you if you look it up. Also, while BM gets very complicated later, starting with it is really easy. Here are the steps:
Blood Altar use
(1) Craft a blood altar and put it down somewhere. A L1 altar is easy to move - just break it and put it down elsewhere - but if you want a permanent location, put it 3-4 blocks up from the normal surface and in a place with 10 blocks free in every direction if you want to do all quests involving Blood Magic.
(2) Craft a sacrificial orb, then shift+rightclick near the altar to injure yourself and put some life essence into the altar. 1 heart gives you 200 LP. Put 1000 LP into the altar (or whatever is needed for the blood orb, look it up in NEI).
(3) Put a diamond into the altar. It will transform into a Weak Blood Orb.
(4) Put some more LP into the altar and put a Stone into it to make a Blank Slate. Craft a Divination Sigil from it. Right-click it to bind it to you. By right-clicking on the altar, you can now see how much LP are in it.
You can now use the altar as required for making
Life Network use and Alchemy:
(1) Right-Click your weak blood orb. It is now bound to you, and throwing into the altar will drain any LP therein and put it into your life essence network. LP in your life essence network is used for alchemy and rituals. Blood Orbs and some other BM items will not do anything unless they're first bound to you by right-clicking them. Put some LP into your network. Right-Clicking the Divination Sigil without pointing it at anything will tell you how much LP is in your network.
(2) Craft a brewing stand and an "Alchemical Chemistry Set" from it.
NEI will show you how the alchemy set works. You need to put a blood orb into the set in order for it to work. See (1) specifically for this. It's easy to forget activation if you're making extra blood orbs for alchemy.
BTW, there is a quest that helps you start with BM at the start of "You're a Wizard Steve"). Also, let me tell you that you do want the bound armor...