I worked for three Deere dealers over the course of 25 years. We had more problems with those barrel swing cylinders then anything else - in regard to hoes. The biggest problem was they'd get scratched and scored inside and leak with no cost-effective fix without replacing major parts. We used to resurface the end-caps. Other then that - there wasn't much to do with a scored-up barrel. And yeah - you could say the same for a conventional piston-and-cylinder unit -but they are easier to fix (most of the time) and MUCH easier to replace with a generic cylinder. That is why Deere came out with the twin-cylinder upgrade/repair kits for some of them.
If you want a Deere open-center hoe, seems you need something off a crawler or a 210C wheel-hoe. Just about anything else is likely to be closed-
center unless you go back to the 1950s OR something like a 1010-2010 wheel tractor. Deere had a few loaders with convertible control valves that worked with open-center or closed-center. No backhoe valves like that - that I can recall.