There is a nice bit in a MLP/Bolo fanfic I was reading. If Grayven has a similar idea then it could make his MLP-ing more... flexible.
Do a deal with one of the DC (YJ) AI (honest, not mad) scientist/engineers, and create a line of AI pets, that look like cute little ponies... Have a few 'experimental' models with allegedly near-human intellect. See what happens when you take one of the best (one-off alicorn?) models through the portal to meet all the other ponies.
If you are feeling really evil get (steal?) a mind print of
John Constantine and stuff it in a unicorn-variety AI pet, then chuck through the portal.
Alternatively, find that a 5th-dimensional imp has done all the above - maybe while looking like you.