The Mad Dogs don't stand out as heavy to me, but compared to the light build of the Beyer's, they could be considered heavier.
If you are used to the LCD line, then you won't find the Mad Dogs heavy at all.
Dan (Mr. Speakers) has instructions on how to properly bend/unbend the headband to fit. The process is very simply and only requires a moderate amount of force. My head is a little bigger so I like where it is. Since I bought mine, I ***think Dan has started to ship them with a little tighter fit. Either way, it's an easy adjustment.
It is still difficult for those overseas still. That's normal for a small company though. I know Dan works constantly to give the best customer service he can and is working to make his services available in as many places as possible with the resources available. His attitude towards customer service and how he runs his business is very refreshing in an otherwise stagnant marketplace. He also has a great team. I had a fun convo with one of the members during the Los Angeles meet.
I was the same way with my research before purchasing. It's a good thing. The more I audition, the more I realize that I made the right choice for me when I bought the Mad Dogs. I had other motives as well. Not only did the Mad Dogs fit my needs, but they gave me the opportunity to support a local California business (where I'm from). The Magni/Modi stack also gave me that opportunity.
Maybe you can find a similar minded Head-fier from NZ with a pair that would be willing to meet up. Never hurts to ask.