Thanks so much for making this a sticky, SAEalumnus!
Now, for the record and for posterity:
Membership in two different NPCs - NOT ALLOWED! (even if it's at another campus)
If you were a New Member of one NPC and you were not initiated, you may pledge another NPC. However, you MUST wait one calendar year to accept a bid from the other NPC.
No "ifs", "ands", or "buts". End of story.
Thank you and have a nice day.
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Apparently, that wasn't the end of the story. I've been informed by ISUKappa that waiting one calendar year to accept a bid from another NPC is only necessary if you stay on the same campus.