Sounds like you need a command line based sstv image sender, so it can all be setup as a cron job.? If your repeater controller has an extra input with vox you can script the play preceded by a voice message the image audio files will follow.?
The pcsi is all gui, and doesn't have a command line interface, which makes it impossible to script.?
My first thought would be a microwave link. If that's not possible.?FFmpeg will allow you to script, get imagery and resize it. You can pull images from a ip camera still image link or the rtsp mpeg/ h264 stream. Reach out if you use ffmpeg. Ive have a script that grabs stills from the local arden network to display them on a web page, followed by a timelapse mp4 that's rendered throughout the day.?
You might consider an nvr for the site. Then grab stills from it periodically to transmit via sstv.?