Yes we've a pal who charters his yacht out of Denia and it took him close to 12 months to get all the permits required.
The local officials (as well as other legal charter
firms) keep a keen eye open for boats being used under charter which do not comply with the regs, and heavy fines / confiscation have been applied to those who break the laws.
If you want more info on what needs to be done then send me a prviate message. I'd be happy to pass you my mates contact details - I'm sure he'd be happy to clarify whats needed.