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PSA: If anyone is interested, I re-downloaded the ORAS demo, and HANS does allow for the Steelix to be caught and transferred to ORAS. You'll have to edit the country and 3DS-region data of the .pk6 to Japan after you transfer it for legitimacy, but it works regardless.
I also was able to play the demo in English and get the Steelix with the region set to Japan. Didn't try transferring that one, but I'm sure it'll work, but you'd probably have to change the language of the .pk6 to Japanese to make it legit.
FYI, you can't transfer the Steelix if you already received the Glalie on that save file, but backing up with svdt and making a temporary new save solves that.
Unfortunately the demo doesn't work with PKHeX, so there's nothing else to really fuck around with besides getting the Steelix
