I don't think so. With KVS it's reasonably fast.
Another way is to go to
www.zuji.com.sg and enter BKK-DXBN in First with flexible dates on Emirates (there is no A class DXB-BKK published fare nor does there seem to be a LHR-BKK one.) Click on random dates on the calendar and if one is available with A class seats it should come up in green. In theory it should work but I am not sure about in pracitce.
Thanks for the suggestion, but hoping for a waitlist to clear "sooner or later" is not why I buy first class tickets. This is something that people do when hoping to e.g. use miles for an upgrade!
True, but it something you should expect when purchasing discounted First Class tickets. If you had an F class ticket, there would be no problem getting seats.
I have no idea why EK blocks out A class on so many of its flights from DXB-BKK even when DXB-BKK-SYD is all wide open but I guess they have their reasons. If holding A class tickets between DXB-BKK (including on RTWs) you need to be prepared to waitlist.
Cheers,