are there any time-tested techniques for dealing with a gust in the round-out that people would like to share?
Go-around. Works every time.
If you're doing crosswind landings by doing a crab approach and then kicking straight (there are other ways of doing it) then there are various risks, such as if you're a bit fast and float for a few seconds after kicking straight you can be blown sideways across the runway. There's not a vast amount you can do if this happens other than a go-around.