OK, so I got a 1" barbed elbow but hit a snag.
The section of the drain hose that the anti-siphon valve fits into points straight up. This means that when the barbed elbow is installed, it points straight out the back, which creates an issue with the exterior portion of the drain hose because it doesn't have a bend molded into it where it fits onto the protruding end of the elbow. I would need to add another elbow in order to facilitate aiming the exterior section of the drain hose either down or sideways.
So, for now I've put things back the way they were so I can at least still use the machine. I would need to fit an additional elbow off the inside drain hose, maybe by clamping on a stub of drain hose to connect both elbows. I don't know if there's enough clearance inside the cabinet to hide all of that rigging. Might that be worth trying or would I just be creating another reason for the spinning to slow down? Any other suggestions?
Another point of concern is that I was surprised to find that where the valve fits into the inside hose, there is no adjustable clamp. There's a band around the hose less than an inch from the end, but the valve just shoves into the hose and that's that. It's a tight fit, and that seems to be enough to prevent any leakage. That's fine if the valve is used, but the barbed elbow is a very loose fit. I presume adding a clamp might resolve that issue, but I'm a little skeptical because the elbow fits snugly into the exterior portion of the hose. Do the two hose segments have different inside diameters?