Stuart;
Just as long as it helps get started, choking only one carb may be enough...but obviously, that one had better be adjusted and work well or Starting success is unlikely when it's really cold.
I expect that your idle is rough during choked condition, because with a single choke, there is also only a single Fast-Idle linkage, so while choked, induction is also unbalanced. Again, I don't consider this a big problem...choke is a temporary condition only for a short while after Starting. Carbs should be adjusted and motor should run evenly for unchoked condition.
I request your permission to use your picture and include it in the linked article.
Cheers
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