I happened upon a really well documented ebay pony, and I can totally do it! They're attached by eyeglass screws, so I can repair them with the right plastics. There's a mold-able quick plastic I know that would work awesomely for this.
Thank you all for the links! I can't wait to repair some ponies! Now I just need money, lol.
Thankfully my disability hearing is soonish (June) So I can start on my various dreams. My "my little pony museum" can have a repair shop in the back, along with an area for conventions.
Until then I'll read and learn and continue mooching off of my parents.