Fixed-wing or Rotary career? (incl Changing licence to Rotary)

[Klimax]

Conversion requirements JAR ATPL(A) to (H)

Gentlemen,

Have: JAR-FCL ATPL(A)/IR-ME etc
Want: JAR-FCL ATPL(H) or JAR-FCL CPL(H)/IR etc.

Anyone up for a quick, short list of the conversion requirements
AND what it would cost.

Thanks Gentlemen.