Blizz's do spawn on the map - I find them in the upper levels of some buildings rarely, but see them in the reactor building fairly often. I still haven't bridged out to it or cleared it, so every now and then when one is outside I'll pick it off with my bow and then fly over to pick up any drops. I did make a safari net and captured one so I can mfr/enderIO spawn them en masse later if need be. I still don't have a grinder.
I know I've seen them on the buildings surrounding the greenhouse and in the reactor shell. I haven't been able to play lately but it's possible that either those biomes exist (potentially as a layer on this map) or perhaps their spawning behavior has been changed for this modpack. Typically they do only spawn in snowy biomes, and even then there seems to be another factor - I couldn't get them to spawn on my agrarian skies snow grinder, but they repeatedly spawned in my direwolf20 1.7 map inside a cave connected to a canyon I used as a natural route to deeper mining.
The easiest way would be to pull as many as you need out of your transmutation table. You did remember to teach it to the table, right?* (I haven't gotten one yet myself so I'm assuming it has an emc value).
Hardcore Questing can do a Detection quest for "player has key?"; once detected, they could pass it to another player or throw it into lava and still "have had" the key in order to progress.
