^^ plus trying to use the "but this is how i bought it" excuse never wins either
i would say that any place that does compliance should have the paperwork, or via your states rego office
oh and the reason its illegal - extra track width puts extra load on your wheel bearings (bearings have a load capacity that fall within ADR's) that could cause them to fail, which would result in a potentially fatal accident.
if you were to find a wheel bearing that fits, which also is documented as being safe under that extra load, you could get an engineer to inspect, test, and possibly write you a certificate saying your combination of wide wheels and upgraded bearings are within ADR spec and safe for use.
the problem you will then have is steering geometry, as the position of the front wheel and the king pin inclination are designed by manufacturers to align to a specific measurement so that the vehicle's steering reacts a certain way. shifting the centre line of the front wheel away from the king pin centre line makes steering heavy and no longer in line with Ackerman steering geometry principles.... good luck getting an engineer to look past that...