Is that 1500 of pure heli time?
In the past fixed wing hours have been 'factored' for the application of a rotary licence and vice versa. That was dependant upon the country issuing the licence.
As the responsibilities for licence issuance is moved over to EASA the individual relaxations as dictated by national authorities is changing and with them the ability to factor hours.
The easiest path is to contact the authority in the country where you intend to apply for the licence and ask their advice.