FWIW, looking around the Dark Forest (maybe other areas too, I haven't tried) where the Witch is can potentially still get you that stuff if you're lucky. I farmed up three Rings of Luck through the 'Air Raid' chain fight and went exploring for a while over there (quicksave and quickload are your friends here if you're not opposed to it) and managed to find a Spirit Defender, which AFAIK is not available anywhere else in the alpha aside from one really hard chain fight.
At the least, for the Angelic Blade and such, you could still theoretically get them if you can manage to clear the Divine Champions chain fight, but actually clearing that without getting destroyed is another story... I'm level 149 right now and I can't do it yet.
Either way, the top ones to clear are:
Divine Champions:
"reward": {"Angel_gear": 1, "Faerie_gear": 2, "Cons_common": 3}
Envoys of the Lust:
"reward": {"Demon_gear": 1, "Faerie_gear": 2, "Sex": 4}
Slime Time:
"reward": {"Legendary_gear": 1, "Male_armor": 1, "Cons_common": 6}
With each type of rewards containing:
"id": "Angel_gear",
"items": {"Angelic Blade": 70, "Angelic Bow": 75}
"id": "Faerie_gear",
"items": {"Faerie Gown": 25, "Necklace of Pain Reversal": 30, "Faerie Boots": 50, "Faerie Bracers": 60, "Faerie Cloak": 79, "Spray with Acid": 100}
"id": "Demon_gear",
"items": {"Succubus'Wardress": 10, "Demonic Cloak": 20, "Demonic Blade": 50, "Demonic Bow": 70}
"id": "Legendary_gear",
"items": {"Excalibur": 10, "Scythe of Death": 20, "Devil Arms": 25, "Draconic Leather Armor": 30, "Draconic Leather Boots": 34, "Draconic Leather Gloves": 35, "Rogue's Ring": 40, "Godward Shell": 45, "Mithril Armor": 60, "Mithril Boots": 64, "Mithril Gloves": 65, "Ring of Recklessness": 20, "Rune Staff": 55, "Boots of Mercury": 70, "Starlit Robes": 90, "Spirit-Defender": 100}
I am glad to hear about a potential beta being quite soon, though.