I do think that would be to much to ask, personally.
The Unicorn wasn't created for GW2 and then locked away behind a wall after the fact, it was created for the sole purpose of being a max-rank reward for GW1 players. As it is, getting the Unicorn is a task that takes time and perseverance to achieve, if you want it pop GW1 into your platform of choice and level up to earn him! The folks at EA and Popcap are being more than generous by giving players an entire year to reach this milestone and unlock the Chomper before the cutoff date. I know where you're coming from with your post but honestly its meant to be special and the sticker pack containing it is even called "313 max pack" believe it or not. If you truly want it, I'm afraid you'll have to work for it just like everyone else. No shortcuts, you've got to be a GW1 rockstar to get it.