Hello everyone,
I just wanted to check-in and provide a little update on this thread. I remotely deployed several releases built genuinely with yocto to devices (raspberry pi zero) which were provisioned with mender-converted images. I had to apply a few hacks, such as manually providing /etc/fw_env.config on each release which u-boot-fw-util usually soft-links into persistent storage.
The devices are mostly running stable (except for some where I prematurely deployed updates with a memory leak 
). I’m clearly NOT recommending here to anyone to follow that which is also discouraged by the mender team. I just wanted to share my experience in case others are in a similar position where deployed devices are too far away to be re-provisioned and where loss of devices is actually not super critical. So be aware! I actually learned quite a bit about things that can go wrong with this approach so, for me it was worth taking that road just for the learning experience 
Plus having more device still an the network for testing on “semi-proper” yocto images.
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