I cant see any reason the company that galvanised the chassis should not give you a Headed letter stating that they galvanised the chassis at such & such a date.
They should really check for Chassis Numbers or ones that are removed before accepting a chassis.
Thats good enough for the DVLA in the UK.
That and a photo record & reciepts do it for them.
They will then say you can attach a new plate with the original chassis number.
(or how ever they feel at the time, they dont bother, best get a need plate tho i would think)
They sometimes ask for an visit of the Vehicle to be looked at, but without a formal VIC.
With that done in the UK, i would hope that keeps the Netherlands people happy.
george