my biggest issue is that my fingers are short, and thin, so I can't stretch width wise enough in the fingers to lose the tip gap. And nothing is worse than gloves that fit like a bad condom. so, stick with half glove, and if it's really cold, slide a pair of the childrens magic stretch gloves under the bike glove. silly? probably. but seems easier than learning to sew.
Have you tried golf gloves? They make cadet sizes for those with shorter fingers. You might be able to find a women's cadet small or a child's glove. The leather gloves will provide some abrasion and heat protection and they also offer pretty good tactile feeling. They will not offer the padding of a mechanic's glove but should provide some protection from the cold.
In really cold weather, you might consider picking up mittens that open at the finger tips to allow the fingers to protrude. The leather golf glove should keep your fingers from sticking to cold metal. I don't live in snow country anymore, but I do see them online from time to time.