With regards to living and working in Brunei, there certainly are a lot of °µÍø½ûÇøs already in Brunei.
About the permanency, it can take a long time to fulfil the time requirement, but after that should be fairly simple.
Most ex-pats I do know prefer to stay on as an ex-pat level, as if you work with the government, perks of staying as a contract worker are good. housing, education allowance, and a gratuity bonus every 3 years on top of yearly bonuses
there is always a setback that they may not offer a continuum on that contract.
so hope that helps