First of all, thanks @balbes150 for the reply. I've read a lot of your posts on here and you seem to be the most helpful forum user I've ever met.
I'm going to see if I can find a newer LE image that is using the 4.20 kernel, but in the mean time, would you be able to direct me to an older Armbian build that is working on 3.14? If I can get a proof of concept here where the wifi module is working on an older build, I'll be a lot more encouraged to keep trying.
Could you also confirm for me that my process for copying the dtb.img file is correct? It seems like it might be too simple, but I'm not really sure how the autorun script is working, so It might be fine.
1. Mount LE image and search in root directory (Partition is formatted as FAT) for dtb.img
2. Flash Armbian image to SD
3. Copy dtb.img directly from the LE FAT partition's root directory into the root directory in the "BOOT" partition (also promatted as FAT) that is found on the new Armbian SD
4. Run autoscript on the SD card from the update screen in android
I'm hoping to be able to share whether or not there is any success here later.
Regards,
Julian