This works and avoids the channel mask and fill. Be careful not to use commas or that will assign to the respective channels.
convert -channel-fx 'red=>green red=>blue alpha=100%' # rrr1
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Swizzling channels seems to be unreasonable difficult to do with the commands available. Here's what I've tried so far: convert -channel BA -fill '#000000FF' <- doesn't seem to do anything or produce a warning, I still see blue in the final image convert -channel-fx 'red, red, red, white' <- despite...