I’d highly recommend against it. A beaver is a big animal, with very small front legs. The joint above it’s front foot is fragile, and a beaver that isn’t drowned quickly will probably wring off. I use footholds for beaver, seldom set a conibear. If I don’t have enough water to drown a beaver, I keep looking for deeper water. If you use a short chain on a slide wire, you can easily drown a beaver in 3 feet of water, maybe less is you catch them by the front foot. I’ve only had one beaver out of 14 that was alive this year....it wrapped up the trap chain on a root in the water.
If you have a trail coming out of the water, but it’s too shallow, consider hanging a snare. The snare only has to be partially submergered, and it can be set with a kill pole. ( CR entanglement regs don’t apply). Some beaver are castor shy, some are square shy....but I don’t think any are savvy to snares.