@mark Im not sure which markets you are referring to but there are markets either side of the bridge - heading north left hand side on thai side, right hand side on the Tachilek side. I know the Thai one dips down to the left on the road up to the friendship bridge in part - question is - is there water either side of the bridge itself and more importantly can the border songteaw from the bus station float if there is :)
No, but I can confirm that it is possible in Australia as I've discussed this directly with the Hon. Thai Consular General for Queensland (he's an old friend). For memory (the conversation was nearly a year ago, may have changed) Brisbane, Melbourne and Perth were offering it BUT you must have a visa into Australia to apply (not the local equivalent if a visa exempt). I have read elsewhere since that a visa is no longer required but not sure.