I tried, but wasn't successful so I just roasted them. I only malted the buckwheat, I have done that a few times now and find quite easy. Just soaked them in water for about 6 hours, using double the amount of water to grain, if you know what I mean? Haha Then I drained them, kept them moist and covered them with a damp tea towel, moving them around every hour or so. Took about 2 days to do. Then rinsed them, put them on a low heat on the bottom shelf of the oven, turning every so often to dry out. Once dry, I put them on the top shelf and turned up the heat. Again turning every so often to prevent burning. Roast until you have the colour you want.
Will let you know how it all works out.