Im somewhat late to this party, James Binnion’s advice is the best so
however ive given it some thought and your question requires a wider
how you go about making this double’ material depends as much on
economics as on a technical approach.
On one hand, if all you need is say 12in of this, then its not
economic to make, ie use solid green gold. however, if you are
planning a production run of the product, that needs yards of this
wire, then there are a no of ways to make it.
Also it depends on the product design.
you can get away with cladding the core with strip if the sections
are relatively straight.
If theres lots of bending and small curves then seamless tube will
take this deformation.
Interesting question in any case.
More on cladding another time.