There is always something you can do to meet their basic needs.I'm on a list but it won't get to me anytime soon. Their nails are growing every day and they won't let me hold them and I don't have the time or money for the vet. They are comfortable and well-fed but the nails growing is going to be a problem that I can't do anything about.
If you are worried about their nails call one of the rescues that you have been told about.
A lot of places (even if full right now) will allow you to bring your piggies in for a nail trim free of charge.
In fact many rescues offer this as an ongoing bonus to all of their adopted piggies.
Even if they don't have a place for your piggies they will have experienced staff who will still be willing to help with basic care so that they don't suffer.