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I think that if you were to add your heavy weight oil to the steering box now, it would mix with the grease and work just fine. IMO, grease is fine in there (but our steering boxes get hotter than yours because of the proximity of the hot exhaust but that is beside the point).
The problem with grease is that is MAY tunnel. The addition of some oil will thin out the grease enough to prevent that.
That said, I put a grease nipple between the bushes on the sector shaft and put some thick oil in through there for those bearings.