I just came out at work yesterday, and I work with nearly all Asians. They don't know yet, but they will on Monday, so I fully understand where you're coming from in terms of cultural differences.
The way I would approach it is that you let your manager(s) simply tell them your new name and stopping right there, unless you dress as your preferred gender. You don't owe anyone an explanation, but I wouldn't go out of my way to make them understand unless they approached me out of genuine care and curiosity rather than nosiness.
My transition plan is to gradually come out to make it easier for my work team to grasp what changes they can expect to see.
Hope that helps.
Princess