Replace DNS on Openvpn client without redirect-gateway

I am trying to push DNS to the client with OpenVPN server with config:

 push "dhcp-option DNS 192.168.x.x"

It is working well, but what I really need is that during the VPN connection I do not want to use my primary resolvers, clients should use only the DNS provided by the server. It can be done with push redirect-gateway, but I do not want to tunnel all connections from the client thru the VPN, only specific networks.

Is it possible to do it somehow?
Linux clients are OK with a script, on Windows I am not sure

Solution 1:

Use redirect-private, but also add route per every network you want to route through VPN.

Btw note that DNS setting on other interfaces will stop work, when that interface will not have route to its DNS servers. This is what happens when redirect-gateway drops default gateway from your (W)LAN interface and adds host route to VPN server IP through original GW. Depends on your setup, may be there is no working setup and you'll have to change DNS naming to include some subdomain for internal networks.