Scott a few thoughts here:
Speakers are generally large expensive items so most dealers don’t carry much inventory on the floor beyond demos so speakers must be ordered from the manufacturer. In many cases your speakers are custom built for you after your order is placed.
3-5 weeks is a very reasonable lead time I waited 12 weeks for my current speakers and that was pre-pandemic.
A $1200 upcharge to get a pair of speakers from the UK to NZ seems fairly negligible when you factor in shipping costs (try shipping anything heavy or bulky these days), taxes and fees, distributor and dealer markup.
Hang in there and enjoy your Proacs when they arrive!