What type of buttercream do you use? Sometimes if it contains butter, it melts very quickly in your hands. Try using a new bag for details, fresh from the bowl, and see if that helps. Also, you can use an all-shortening version of buttercream for your small details, if needed. It doesn't taste as nice, but it is less likely to melt and it is much whiter than butter-containing-buttercream.
There is so little of it in the details that the taste wouldn't be noticeable.
I know I have seen white icing colour, but I have not used it.
That's all I can think of for now, I hope you find something that works for you!
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