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Once you get it down, I'm sure you can spam it just as easily as a double half-circle. It would be easier for people to learn the double half-circle, yet I wouldn't say the motion is less "long".
You are pretty much explaining the argument why the move notation needs to be changed with those comments.
"Double circles can still be done quicker and would open the move to spamming still." and "can now do it consistently on pad and stick without any telegraph or set up" to me are contradictory statements. If you can do it consistently without any telegraph or setup, you can effectively spam it yourself. It may have taken you plenty of work, and I'm sure you would be a little frustrated if that work got marginalized (and given how Ivy changes as much as Athena's outfit in KOF, Ivy players have a right to complain) , but this would make more people able to do the move period, which would encourage more Ivys, without overpowering Ivy. If for some reason it does overpower, you can balance Ivy plenty of other ways. Bad design is bad design, no matter how iconic.
This is not a criticism of you, Ivy, or your gameplay, just the logic behind your defense of the motion.
A Wii exclusive would be terrible. A Wii version would be alright, though no one would play it due to friend codes.