If you ask me, you sound a bit confused. I would play it safe and fly. You can get an Air Asia flight from, for example, Johor Bahru to Kota Kinabalu for 130 ringgit, which is a lot less than you're going to end up paying attempting to get there overland.
I'll consult a doctor and if its safe to fly, I 'm off to KK and just go to Brunei and Kalimantan. I still want my stamps. 130 Ringgit, even if its not advance booking? Id assume thats air asia. Okay, thanks, I dont think I am dying to go to Jakarta anyway.
I want to go home. I have a friends travelling in my country. I need to get there before they leave.