Hey bussone,
No I do not know any of them.
Who are they? 
Are they more for flavouring food or used as oranges as a treat by thelmseves?
Some of these are not in commercial cultivation, but you live as close to their native range as anyone, so...
http://www.homecitrusgrowers.co.uk/australianpngnativecitrus/citruswakonai.html(Micro)citrus wakonai, warburgiana (new Guinea Wild Lime), and papuana (IBrown River Lime). Also Citrus gracilis. Papuana and Gracilis come from the Port Moresby area. Warburgiana from the southern coast, and Wakonia on the eastern islands.
There's citrus garrawayae (Garraway's/Mount White Lime), which is also found in Australia.
Citrus inodora (Russell River Lime)
You could also try Citropsis articulata or Clymenia. These are citrus-adjacent and will hybridize with some members of the citrus family -- Clymenia substantially more easily than citropsis.
(A few sources are of the opinion that clymenia belongs in citrus.)
Kumquats don't seem to mind the tropics.
Wakonai may be worth pursuing -- it matures the fastest of all citrus, has a short ripening time, flowers continuously, and has a high seed count. It turns over generations faster than anything else.
https://journals.ashs.org/jashs/view/journals/jashs/138/1/article-p57.xml(They apparently also had some success crossing poncirus and wakonai, although it's a hybrid with issues)
For some of these, whether or not they will hybridize is somewhat unknown. They aren't worked with much.