The only experience I have with this technique has been for lightweight crew in light air. The boom has been left attached to the boat at the downhaul and mainsheet and the rest of the sail left loose. It is a slow method, it takes time to pull the sail down. I suppose I would try to lash down the sail somehow if it were needed for rougher conditions.

I don't consider this a regular righting method, it is a method to get the boat back up when normal methods aren't getting the job done. At that point sometimes just getting the boat back up and sailing to safety under jib alone is all you're looking to do.
I have raised the main on Hobie 16s and 18s out on the water, it is harder.

I've looked at shroud extenders. We even tested a home built version on one of the 16s. Our rope tie-down to hold the mast in the socket was insufficient to the task. The boat comes up amazingly fast once the mast comes off. We haven't experimented since then. The kit from Hobie includes a tie-down to hold the mast in the socket for the 16s and 18s. I believe it uses wire rope.

John C