That sounds like a real hack solution. Why not just use the appropriate adapter? Here is Rg-59 coax connector to RCA. Almost ever other type of adapter exists as well or combination of adapters can get you to what is needed.
https://www.amazon.com/VCE-2-Pack-C...9Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=
https://www.amazon.com/VCE-2-Pack-C...9Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=