Yes, you can route traffic from your PC to the Wi-Fi repeater.
Yes, you can route traffic from your PC to the Wi-Fi repeater.
ohboy, here we go again... presuming this minecraft server will only be used for yourself and your direct friends it depends on how the repeater works, but really using wifi for a server isnt a good idea. i'd say just try and forward the port, and see if it works, but you may get really wonky latency.