I have hand-raised hatchling finches before. I use a TB sized syringe and a feeding canula. With them they are naked though so you can see the food go into the crop. They also generally open their mouths for the food unless they are not doing well.
Just found this link:
http://www.internationalcockatielresource.com/hand-feeding-utensils.html
That link has give me some new ideas to try and I found it thanks to your post!
-Kathy
