Will you be using an Argon to do your development since that is the only available WiFi mesh dev board? At your dev site, you can create a mesh network using that Argon. When you get to your project site, you will have to create a new mesh network starting by adding the Boron, then all the Xenon endpoints to it. I did almost the exact same thing today. I had a mesh network using hard-wired Ethernet with a Xenon as the gateway. But I have an Argon I wanted to switch over to. I had to start with the Argon and create a new mesh network. Then I had to take all the Xenons from the old mesh and run them back through the setup in the mobile app one at a time. The app will ask you for each of those Xenons, do you want to “Leave the mesh network”. If you choose leave, it then scans for a new mesh network to join. In my case I chose the Argon. In your case you would have to choose the Boron.
You don’t even have to flash new firmware at the project site… the user firmware will already be loaded from your dev testing. It should start to run on the project mesh network without interruption. Except that if you cannot flash the firmware to the Boron at your dev site, that might get a little tricky.