Does Autocom or one of the others have a Spanish distributor? That to me will give the practical answer.
Legally it will be a mess. A vehicle or helmet legal in the UK is legal in any EU country. The UN guarantees right of transit. Local laws even to the level of town council bylaws compete with world level agreements and a local may be more restricted than someone passing through.
The Spanish plod have a horrible reputation for enforcing the local regardless of the International. They used to like impounding bikes towing trailers and sidecars fitted on the UK side.
I have used an intercom in Spain without hassle.
Andy
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