"I think this might only be a problem for people who already had the (retail) game with DLC unlocked on the BSN and are trying to migrate it into Origin."
Wrong.
I believe this is the whole issue as well and I'm in full agreement with you. All DLC was unlocked and purchased through the BSN and now that network is closed and none of the DLC for the Collector's Edition will work, nor will Origin Wardens upload to the keep this is the problem that I'm having. I fully agree it is due to the BSN not being available anymore. This is where all your characters were stored by Bioware and EA. They have really messed this up.
a. Your "characters" have nothing to do with your DLC entitlements and never did.
b. Your BioWare/BSN account was integrated with (one of) your existing EA accounts a couple of years before the BSN was switched to read-only.
So that has nothing to do with "missing DLC".
What does have something to do with it is having multiple accounts. Maybe just with EA, maybe with the PSN or XBox as well.
