Using encrypted DNS doesn't necessitate routing all your traffic through your home network. You can still encrypt all your traffic by using an encrypted DNS service or, if you really want to, a VPN service. But moving everything through your home network is not necessary, especially if you have any kind of usage caps.
And to further reinforce this point, one of the basic config variables for wireguard is your dns servers. You could literally send no traffic but your dns queries to the wg tunnel.
