I guess it will depend a lot on the success of other Custom ROMs. Please include a reference here if you become aware of work on an unofficial Lineage build, or if you find references to an AOSP device tree and /or the device codename.
I haven’t seen anything about unofficial Lineage builds, but the developer said that it should be able to support ubuntu-touch and someone is working on Luneos for it.
btw, while this is a frankenstein revival with new internal hardware, there is movement on getting at the bootloader of the original KeyOne - see the linked reddit thread at Blackberry Key2 news - #3 by tcecyk
[–]StefanLeonard
This is great news! But I really hope there will be some keyone advancements too soon
[–]MelodicWishbone4969
It will ! But the security is higher on the Keyone than it is on the Key2