Kasha: in Charadi E”Y you are correct (can’t speak for Dati Leumi), as the action of holding hands would be Lifnei Iver.
Wolf: in Marine Park you are correct, as the action of holding hand would not be seen as “creating Hirhur”.
(Disclosure: My Rosh Yeshiva “discourages” couples holding hands in public. In general, the Ittisa and I are Makpid not to pass things to each other while not in the privacy of our own home. No reason to announce anything to anyone, but that is just a Geder of Tznius).