It can be done but you will need a device at home which will run Tor for you.
1. Setup Tor on your Asuswrt Merlin router and set route to the home device running tor.
2. Install Tailscale on your home device running tor and set it as an exit node.
3. Run Tailscale on your device away from home and set your home device as an exit.
4. Now all your traffic will be routed through tor inside a wireguard tunnel.