As per my other post - PiHole + Unbound - DNS views with Wireguard VPN - #3 by mrc989 - I did configure Allowed IPs in the Wireguard Android client and it proved to be a viable solution to my problem.
So no need to configure DNS views in Unbound in this case.
Bucking_Horn, I have the feeling that this post can be deleted to avoid confusion with my other post - my fault as I was overcomplicating things.