I now believe it would be possible to support rtw(4) devices incorporating GCT RF tranceivers, however I can't find any devices for sale here in Australia.
If someone has one of the following they could send my way I'd appreciate it. Edimax EW-7126 PCI HomeLine HLW-PCC200 CardBus GigaFast WF721-AEX CardBus Longshine LCS-8031-R PCI Pentagram HorNET PCI PLANET WL-8303 PCI Repotec RP-WP7126 PCI Sweex LC700010 PCI Tonze PC-2100T PCI TP-Link TL-WN250/251 PCI There are likely more devices, it should be pretty obvious to see which radio your rtw has by looking at your dmesg.