Since they are feral, most ACOs will just euthanize them on admission. I know you've said Harmony House will work with ferals.

You can NOT catch / pick up a feral -- you must use a trap! See if you can borrow one from someplace. Check with a TNR group in the area, many of them will loan out a trap for a small rental fee and a large deposit which gets returned when you give back the trap.