With the POD now almost twenty years past, there might be another Austro-Hungarian having an eye for Sabah, or maybe another European entirely.
Anyhow, this rounds up the 1850's for Sarawak and for Borneo. By this time around, the surrounding world would have changed just about enough to affect major events in history, and with luck my next update (which might take a while to think about) would focus on these changes.
As again, if I slip up or made something wrong, don't hesitate to tell me; I might have read a few more things, but I'm still clueless about 19th century European history in general.