UTP Baluns

My customer has intercom gate entry to their home with a small analog camera built into the pillar. The coax (underground in conduit) run is approximately 350-450' to a standard analog DVR in the home. He lost video feed and after testing, it appears the issue is with the coax. There is no handhole between the home to the gate pillar and unfortunately I cannot remove the pillar top.

I'm trying to find an inexpensive alternative to get this camera back up and thought maybe to use the unused pairs from the intercom with baluns. I've honestly never used baluns before and while it seems simple enough, I'm wondering in this particular application if I will run into issues with the intercom (between the voltage there and my picture quality).

Has anyone done this, been successful, or have any other suggestions? Thank you,

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