Thank you, nitram. You saved me a lot of labor!
I did not discribe the details of the method because it would make a post too long.
But I feel its terseness might have made the post defeat its own purpose, namely, to ease some difficulties beginners face when they want to enjoy the great micro-ness of microCore. (I'm a beginner who made just one post after a lot of cycles of googling, trying, rebooting.)
So, whoever wants to know the details, feel free to ask.