Laws of Liberty:
"The transport of Nuclear Devices is only permitted by the Primary Fleets, Liberty Corporations, Borderworld Exports and Gateway Shipping Inc."
I was shot down in Gateway Shipping vessels; it is not written that only primary (official) corporation ships can transport it.
Back to this topic: if a commodity has sell points only in Rheinland/Kusari/etc., it is very clear where it came from. Same with uncut diamonds for example: if you are flying a lawful vessel you won't be able to tell a Xeno not a Kruger/Daumann guy mined it for you.
Well, the Reinforced Alloy is sold on a Xeno base, so "Purists amongst them should not build Bases" is not that true, as they have access to the main maintenance commodity.
I just thought these commodities (at least the ones for maintenance) will be more widely available.