Technically yes. In fact, that’s exactly what smartphones do when they operate as a wifi hotspot: packets come in from the mobile provider and are IP routed to the Wifi network, and vice versa. Whether this happens using Legacy IPv4 and NAT, or with prefix-delegation on IPv6, it’s still routing.

it could, root it and setup iptables, connect it’s USB port to an hub of Ethernet adapters.

It would probably be slow though but sounds like a fun experiment.

I don’t think the router bits would fit in the phone slot and you would have to manually turn the phone to get the bits to route any design into the edge of the wood. I don’t think it would work at all! ( No stupid questions, then no stupid answer’s amiright! )