Minimal config for transparent proxy to alternative gateway

[henrypijames]

I have two (outbound) gateways on my network. One, 192.168.1.1, is the default gateway specified by DHCP; an alternative one, 192.168.1.2, can be manually switched to - in which case all outbound traffic would go through that alternative gateway.

Instead of complete switching to the alternative gateway, I want to keep 192.168.1.1 as the default gateway, but have V2Ray listen as a SOCKS proxy and forward all outbound traffic it receives (any destination that isn't local) transparently to 192.168.1.2. No encryption is needed as local traffic is assumed to be secure.

What would a minimal config for this purpose look like?