You might find it difficult if not
 impossible.
 
23 years ago I bought a new 125cc.  I got  full comp only because it
 was a new bike and the cost for cover was £400 with high excess,  with a full no claims bonus (in 1988). I had just come from UK where
 full comp on any bike up to 350cc was £70.
 
My 600 Yamaha is insured with Linea Directa,
 but only 3rd party and breakdown and that is about 250 Euros, 100 euros less
 than with Liberty Ins which I changed from two years ago.
 
Good luck Alfonso
 
PS     I tried to get a Linea Directa Tel No.  but all I could find was this, which appears to be an agent for them (in English)  800 200 369, if they do not do full comp maybe they could recommend someone