IMO...
As with fine art, antiques, collectable cars, etc., provenance is VERY important. If it was born in the Alembic factory, it's an Alembic. If it's too badly mangled, it's still an Alembic, but just one with very little value.
Any and all modifications, even those made by the mothership, should be documented and disclosed. I would expect that non-factory modifications would negatively affect the value of the instrument. Only something like Stanley made this change when he owned this bass... and then FULLY documented, might be of value to someone. Many factory options/mods should also increase the value (e.g. changing bass/treble to filter/Q).
While any instrument can be improved by adding Alembic parts/electronics and then described as with Alembic _____, such an instrument is not an Alembic, even though it may sound great.
Just my opinions...