I have been using Dotan system on my TheMightyHobie18 for 5 years.
This kick-up rudder is easy to use and I must say it operates perfectly.

Aluminium upper and lower castings deteriorated in my old rudder. Every part and even blade were dangling here and there.

As to Dotan I have never experienced any probs with gudgeons. In theory it rips off when you clash with any obstacle moving backwards, but such strike is hardly imaginable.
And while beaching maybe it is worth to kick up the rudder and trim the sails?

Rob.