You argument fails at the first sentence. The list of deep collaboration between Israel and the UK is too long for this post, and I won't list them, as you know it but are not arguing in good faith.
>The entire concept is tinged with antisemitism
But we can't say Zionism is tinged with racism? A blindingly obvious double standards.
The Zionists parties of Israel want to do ethnic cleansing in the Palestinians territories, and will purge the Arab Israeli the second they grow too big. Is there a gentle Zionism somewhere, that only wants Jews to emigrate to Israel to live their faith without all the war crimes? Maybe, but it is as relevant as the religious anti-Zionism that objects to it on religious grounds. Which is too say: not at all relevant.