After learning something more from
dimasic and
NiLuJe (thanks guys).
I have updated my 3 guides (metadata only, no new content) to Klingon v0.5, Vulcan v0.3, and Ferrengi v0.2.
I am hoping that upon sideloading the .azw or .azw3 split components, thumbnail cover view will work consistently and the personal document banner will not show up.
I have split the combo .mobi generated by Kindlegen and I have included in the archives the KF8-only .azw3, and KF7-only .azw components after modifying their metadata per
post#64
Grab them from spoilers of the
OP