How can I use pam_exec.so in RHEL to grant access to vsftpd based on the user's IP address

Solution In Progress - Updated -

Issue

I've tried to use pam_access.so to grant access to vsftpd virtual users; however, as described in How can I use pam_access.so to allow virtual users access to FTP, this isn't possible. Can I use pam_exec.so to do something similar?

Environment

Red Hat Enterprise Linux 7

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