I have been thinking about a Sanborn Nessmuk and it may meet most of your criteria. It has a smaller blade than many all wood paddles, and is designed to compete with carbon paddles (but is still mostly wood). It is actually lighter than some carbon paddles on the market. It’s a bent shaft, but I’m sure they would make it in a straight shaft if you called and asked. If you’d like more durability they can also add more glass, etc to beef it up at the cost of more weight. I have their Minnesota paddle and it is extremely durable so far (but it does have a lot of glass and isn’t as light). I’ve accidentally dug it in gravel and bounced it off rocks several times and I can never tell it’s touched anything but water. Not the cheapest option though.
The Nessmuk - An ultralight canoe paddle designed for comfort and endurance on long days of paddling.
sanborncanoe.com