Extend An Existing Security Panel 800'?

I have a large residence with a DSC panel (not installed by me around 2009) PC1864, with 4 zone expansions already.

The client is building a large barn to house his toys. I would like to "extend" his existing panel out to the barn with 20 more zones and 4 keypads.

Security dealer says i am nuts. It is about 800 feet from the house to the barn.

Has anyone done this? Is there a security panel better suited for this?

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