My Mikrotik router does this easily. You can tell it (with a Firewall NAT rule) "any outbound connection to port 53 is to be redirected to this internal IP and

My Mikrotik router does this easily. You can tell it (with a Firewall NAT rule) "any outbound connection to port 53 is to be redirected to this internal IP and port" -- and this internal IP and port is where my PiHole is.