Just to follow up for fun... taking my cue from the form-a-funnel concept, I took this empty milk container (goddamn sideways thumbnails!
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... and cut some bits out of it to use for directing fuel into a container:
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The closer piece includes the handle as a small funnel - it fits right up under the drain screw, doesn't foul on the overflow hoses, and I can even easily hold it by the "handle" part. It doesn't work well on carb #3 due to all the hoses, cables, wires and clutch cover, so I cut a plain ol' "trough" for draining that bowl... they work a treat!