You can use an iptables rule on your router to rewrite the address to your custom server, which I have done specifically because Google devices were ignoring DHCP.

Something like...

iptables -t nat -A OUTPUT -p udp --dport 53 -j DNAT --to x.x.x.x:53

...should work, and repeat for tcp

It bricks the device. See these previous discussions.

[1]: https://mailarchive.ietf.org/arch/msg/dnsop/WCVv57IizUSjNb2R...

[2]: https://news.ycombinator.com/item?id=19170671