The referenced LXD related discussion on problems with bluetooth within container is about seven years old. Maybe the related defitiencies within the linux kernel have been modernized by now?
Anyway. In the LXD issue tracker this issue was closed in may 2017 and a reasonable workaround was pointed out that makes use of libusb’s userlevel bluetooth stack in conjunction with the usb device type.
So maybe there could be a comparable solution in our case with alien dalvik? Having to plug a USB BT dongle into the phones USB-C in order to rent e-scooters or set up solar inverters surely would be a no issue at all. It would indeed remove one of the bigger pain points 
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This will be a showstopper for me for using Jolla and I would have to say goodbye to Sailfish, even though I have been there from the very beginning.
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There is a patch which was not merged:
https://lore.kernel.org/lkml/20170814071640.289327-1-fupan.li@windriver.com/