The nation France has traditionally made itself a haven of asylum for any number of politically persecuted individuals, regardless of their political alignment.
I am quite serious when I suggest contacting President Sarkozy of France in asking for official asylum for Chaim so that he may live safely in France, and from there gain a larger worldwide audience for his views.
This could be reinforced with a JTF American-based "plan of action" of non-stop bombardment of media & public officials bringing Chaim's plight of not being allowed either to enter Israel or to campaign for office there into the focus of all opposed to political persecutions and all those opposed to anti-democratic governments.
Before you dismiss this idea, it worked exactly as I describe to give the Ayatollah Khomeini asylum, protect him, allow him to propagandize against the Shah, and then re-enter Iran from where he had been banned.
France has also granted asylum to any number of American Communists, Black civil rights activists...almost anyone who can prove political and/or religious persecution.
President Sarkozy is just the right guy at the right time to give serious consideration to Chaim's petition for political asylum as someone being persecuted by "Israeli Zionists"
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In effect, JTF could utilize "liberal socialists" who believe in always siding with "the underdog" to actually champion Chaim Ben Pesach in his struggle to return to Israel a free man. (might take a little "spin doctoring" to provoke a lot of sympathy for him but that wouldn't be as difficult as the spin which was required to make Ayatollah Khomeini appear to be a "kind, Christian, Saintly, old man driven out by the cruel demon Shah).
Short of having success with this plan, the only thing I can think of is to dress him up as a Chassid (Begin pulled this off in his youth), and being dropped off ashore in the dead of night complete with forged papers identifying one Rabbi Yossi Cohen (perhaps followed by another sea-drop of weapons and ammo for Jewish freedom-fighters who need self defense against the brutality of Olmert and his gang of criminals.)