Maswings did have a recruitment drive back in June, I'm not sure whether they're still hiring. For FOs, yes, you have to be Malaysian BUT it won't be a problem if you're coming in as a Capt...
They're operating 4 Twin Otters, and about 10 ATR-72. If you're on the Otters, Miri is your base, do expect around 30-40 hours of flying monthly whereas the ATRs are based in Kuching or K Kinabalu. Monthly flying hrs are around 50, it could go up till 80 during holiday seasons...
You can also try and have a look at Royal Brunei Airlines, IF they're hiring
