I am working with a group of students who only have access to chromebooks and I'd like to use the Feather HUZZAH with them. Because they're using Chromebooks they are limited to the Web Editor. There doesn't seem to be any way to select the Feather board. Any advice?
No. There's no way. It is possible to use the real Arduino IDE on a Chromebook:
https://forum.arduino.cc/index.php?topic=554826.0
It is on the "TO DO" list.
I suspect it wont be too far in the future.
Stick with Pert's suggestion for the moment.