Try contacting the owners of all three of them. I run the Central Jersey Radio Network that the Wynnewood site is part of, and you don't need to be a member to use it. If you request permission through our website at
Central Jersey Radio Group, you'll automatically be granted permission for all of the repeaters we manage. All the repeaters are free to use, although each owner may have their own rules like hour restrictions (no calls after 11pm, for example).
I've talked to the owner of the Norristown repeater, and he doesn't mind occasional users on the system, but contact him first before jumping on. I never used this system or the Aston system yet.
The owner of the Wynnewood repeater is Anthony WQFF822, and another frequent user is Mark. Just put your callsign out over the air and ask for one of them. Whenever I visit Cherry Hill, NJ I talk on the Wynnewood repeater as much as possible.