Hi D90h, welcome and very nice truck! There are many guys on the forum with tubular winch bumpers (new and old trucks) and they all seem to be legal and insured, so worth a double check. If the info came from your dealer, you would be safe to disregard in total!
In Perth your best option for a tubular bumper is going to be Rovacraft in Bassendean. They will also stock the matching steering guards and diff guards if you like to keep to the same design in future. The vendors on the forum are all great chaps and they'll help you with any problem, but I think the weight of the bumper will kill any option of buying it from the Eastern states...
Obviously they offer very little in the form of frontal protection over the standard bumber, but as a winch and driving light mount they are absolutely perfect.

