The value of an Alembic is subjective… it is worth what a buyer wants to pay for it. Someone here relocated their PU selector switch and filled the void with an old coin. It is unique. Some may poo-poo such a modification, some would applaud it and find it unique and consider it an upgrade (relocated switch for slappers and extra bling for the lookers).
If a buyer wants an Alembic because they nearly play themselves and their tonal palette is vast then everything else is moot.
Some buyers want a shiny and mar free appearance with original location of switches and no belt-buckle rash. For others, a ding here, a checked finish, a hole from a relocated strap button, etc. does nothing to deter them from wanting a particular bass. As long as there is no structural damage and the electronics are functioning proper, who is to say a cosmetic feature decreases the “value”?
Let us know what major city you are near, someone may know a trusted luthier who could do the work if you are not comfortable doing it yourself.