Why do you want to keep the split sleeves?
The tie rod ends were never the weak link, the split sleeves are. The reason for the upgrade to 11/16" was to eliminate flex in the split sleeve adjusters, obviously an 11/16" split sleeve adjuster will have less flex than the stock 9/16" split sleeve adjusters. But a 9/16 tubular adjuster will have a lot less flex than a 9/16" split sleeve adjuster, and probably still less flex than even an 11/16" split sleeve adjuster.
I've never had an issue with the 9/16" tie rod ends using tubular adjusters. Honestly, I'd rather run a 9/16" tie rod ends with a tubular adjuster than 11/16 tie rod ends with a split sleeve style adjuster. The tie rod ends themselves aren't the strength issue.