The last page of their catalogue has the address as Taiwan.
www.bomboramarine.com.au/WebRoot/ecshared01/Shops/bomboramarine/MediaGallery/Catalogues/Master_catalogue_2018.pdfI bought one of their M8-12 halyard clutches a few years ago and it was good but the installation instructions called for M4 fasteners in the 2 mounting holes - this was way too small for the 600kg rated load and I used M8 which was fine and fitted in the holes as designed in the clutch. I fed this back to them and they rapidly agreed, apologised and changed the instructions to M8. Maybe you could check that the fastener sizes as designed are suitable for the fairlead for all load cases. Might be an idea to put the 2 highest loaded lines on the 2 outside holes adjacent to the fasteners.
They sell the Trogear asymm kite prodder which seems like a market leader. Trogear looks to be French and spendy.