Adding a rule and a static route to... route all packets from a host through a specific wireguard interface. How?

Installing and Using OpenWrt Network and Wireless Configuration
10

Add a metric to the wireguard interface:

uci -q delete network.wan.metric
uci set network.wg0.metric="100"
uci commit network
/etc/init.d/network restart

After doing this, you should see two default gateways. The one that uses the wireguard interface should have higher metric (lower priority).

root@OpenWrt:~# ip route show default
default via 192.168.1.1 dev eth0.2 proto static src 192.168.1.254
default dev wg0 proto static scope link metric 100
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