[ciokan]

Can I bind it to external ip addresses and give a certain user an outgoing (or even private ips that I can then forward) address I chose? Don't know if my question makes sense but I'm interested in routing a certain user to a certain ip every time he/she connects.

[zx2c4]

WireGuard as a simple associations between public keys and each public keys list of allowed IPs. Within this structure, it seems like you should be able to do what you want.