Now that I have narrowed down a separate issue with sysupgrade, I have compiled images that should be fairly representative of what how things will be if support gets integrated into LEDE.
A few other notes. The ‘omnia-btrfs’ branch exists only for my own reference, it is abandoned. If you want btrfs, I suggest staying with Turris OS. Personally I am only looking for a device with a fast CPU but otherwise behaving like a ‘classic’ LEDE router. While I do not object to the idea there is no motivation on my part to get btrfs into LEDE.
LEDs should be relatively easy, I think Xiche got them working but I have not tested.
See: https://github.com/rmounce/lede-source/commit/4bcbbc79b94bf8aa182a7cb5f8a5f6981dceb338