Tillydog
Pack enough grease into a freehub and you’re quite right, the pawls will retract and not spring out again. Having said that grease is fine in most freehubs provided there’s just enough (and not too much 🙂 )
I’m experimenting with wet chain lube this year on my road bike, but use Castrol MS3 lithium-based grease otherwise. I’ve had it for so long that I don’t think you can buy it now
Grease is mainly oil (80+%) with thickeners (e.g. lithium soap) and additives (e.g. rust inhibitors)
If you are experimenting be sure to clean the old grease out, the different compositions sometimes don’t work well together