ANSA Rules permit 1.5 x rod length of leader, which can comprise any combo of double/leader/trace, of any breaking strain.
So yes, you can have heavy leader to hook for chafing purposes.
To combat loss of membership due to people wanting to use braid, the rules now allow a system similar to flyfishing. You can use braid main line with the same rules as above, however you must include a break-away section of at least 500mm of the line class line. This has good and bad points, espeshally with 1kg, as you have little stretch and it's easyer to pop the 1 kg section.
I use both metods, flaties were caught with all mono and Jew with 2lb fireline with 1kg pretest breakaway and 12lb vanish leader to hook.
By the way, lines used are all pre-tested (like Platypus Pretest) to break under the rated strength.
R-C