We are amazed how our ferals will become very submissive under stressful situations for them, i.e. vet visits etc. Maybe you could put the 3 outside cats together in a carrier, that way it would keep them somewhat seperated from the others.

Please check out relocation guidelines on this site. It gives some good pointers on how to do this. Please check out the confinement section! Let us know how it goes and good luck! I'm so happy to hear you want to take them with you!

http://www.alleycat.org/ic_fs_relocate.html