Hi, I'm sorry to revive such an old thread, but I had the same need as you guys for doing just this very thing: using BLE beacons for location and presence detection.

I made my own solution to it using an ESP8266 dev kit and a Nordic-based BLE module. You check out the project here: https://www.happybubbles.tech/presence/ where I have the beacon gateways for sale. But I've also made all the work open-source and open-hardware as well. I hope this helps you guys out if you're still looking for something like it.

Hi everyone,

First time posting here, I made a project you guys might be interested in. It's a little easy-to-use Wifi-enabled RFID reader. It's based on the ESP8266 and what it lets you do is connect it to your home wifi, then when you press a tag to its RFID reader, it sends the tag's ID as an HTTP POST request to any URL you want. The data is sent over JSON.

I've put the source code up here: https://github.com/happy-bubbles/nfc and it's pretty easy to set up and use if you're familiar with the ESP8266. I designed it to work best with the NodeMCU kit and the cheapo MFRC522 RFID modules.
My build is pretty ghetto and looks like this: http://imgur.com/CHT4nzz
That fancy case was the former home of my son's bottle-nipples. I'm sure you guys can make it look much better than I have.
If there's enough interest, I could design a PCB for this thing so it could be neater.

Anyway, I hope it's useful to some of you. Thanks for looking!

My advice would be to visit Alibaba and try to find someone who sells the product most similar to what you want. Then reach out to them about modifying it and branding it for you.
Some sell iBeacons and such in wristbands already, so it might not be too big of a stretch for them to customize it with some other electronics that you might have in mind.

Good luck!