Ah, that makes sense.
I have an idea, but you may not like it The MKR1000 is just a WiFi board, I assume there are some Arduino-style commands to open ports and whatnot (I haven’t used it, though, so take that as my assumption). What I would do is turn that into a gateway. The majority of the logic for our gateway shield lives in the nrf51 chip, we pretty much just use the Photon as a dumb internet back-end that can open up TCP sockets for us. Then we simply send data to it through SPI and it forwards it to the TCP socket.
What you could do is translate the Photon sketch that we use for the gateway to the MKR1000, then pair it with our gateway shield and that becomes your gateway. Now you have the wonders of the Particle ecosystem but you are using an Arduino. As we already have the Photon sketch, I don’t think it would be too difficult. The wiring may be tricky, the MKR1000 almost certainly wouldn’t fit our current socket, but an adapter board would work (if you wanted to make a PCB) or you could just breadboard it with jumper wires.
Looking a little further, can you even buy the MKR1000 yet? It doesn’t appear to be available? I guess you could use the Yun in the same way, though it is terribly expensive. Perhaps a WiFi shield?
Also, I see this in the rules:
All submissions must include Windows 10 and Arduino.cc boards (only)
Not sure if that means you can ONLY use Arduino boards and no others, I suppose it could be read that way. If that is the case, then using bluz may not be allowed.