Tunnel LAN to WLAN network (through a proxy)

Installing and Using OpenWrt Network and Wireless Configuration
1

How to set it up like this?

The OpenWRT router (TL-WR740N) is a wireless client.

The wireless network has a subnet of 192.168.0.x

The router has the address 192.168.2.1, because it is connected to the local network 192.168.2.x (DHCP is disabled, each has its own address statically registered: 192.168.2.101, 192.168.2.102 and so on)

It is necessary that access to the 192.168.0.x subnet (including the Internet) is available only to those who have either a VPN client or some other proxy client installed on their PC (192.168.2.101, 192.168.2.102, etc.)

Maybe someone has a similar ready-made configuration?

2

installed or running ? it's a big difference ....

3

There may be a language barrier (I know English at an elementary level)

VPN must be launched using standard Windows tools

4

You could block all access to 192.168.0.x in the 192.168.2.1's firewall, leaving only ports used by the
VPN and/or proxy to pass, going to the IP(s) of the proxy host and/or VPN server.

5

I need to first configure the router so that it connects the two networks.

6

then you probably should have opened with that ...

go to wireless -> scan -> join.

put the interface in the WAN zone.

btw, time to upgrade - https://openwrt.org/supported_devices/432_warning