Seeing as how the OP is in China, I suspect he does not have access to Munich Malt. So what could one do? Simply toasting it, will just give you, well, toasted malt, which can add great flavor, but not the same as Munich.
I might try soaking the grain in water for say 30 seconds and then spreading it out on a pan in the oven and heating. This should slow down the "toasting" while allowing some of the other chemical (maillaird) reactions to occur. I would, to quote BBQ masters, cook it low and slow. You run the danger of denaturing the enzymes if cooked too hot. Of course this doesn't matter if you use additional base malt to help it convert.
Keep a record, so if it works, you can easily repeat it