What's the best way to direct certain devices on my network through VPN?

Hi all. I currently have an eero network at home and I'm running piHole as a DNS server. I'm interested in building a VPN gateway with RPi, but I'd like to be able to point devices to it on the fly without having to mess with too many settings. Ideally, it would be awesome if I could assign profiles to my devices at the router level. One for VPN and one to bypass. That way if I wanted to switch profiles on the fly, it would be simple to do.