1922: Britain gives The World Zionist organization the mandate to administer Jewish immigration and settlement in Palestine. This immigration and settlement was funded by American Jews

This page  explains some of the problems of the accuracy of the figures but censuses in 1922 and 1931 show a more than doubling of the Jewish population of Palestine albeit from 84 to 175 thousands (round up slightly) Estimates for 1937 show a further doubling to 386k.

Of course these figures do not include those Jews who left continental Europe for Britain, the USA or other countries. Quite possibly they would have been refused entry and directed to Uganda - or rather "Israel in Africa" which would have been a separate state. The figures for Palestine do howver make my point that there was some emigration before the Nazis came to power but it vastly increased once they had.

Without the restrictions put on by the UK, US and other countries, more would have been able to leave for Africa than managed to get out before September 1939.  The industrialisation of death came fairly late, well into the war and with all the intelligence about the camps it might have been possible for the WJC to persude the Germans to see expulsion to Africa, under the neutral flag of say Spain or Portugal, as the "final solution".

Now the additional numbers surviving might not have been that great but as the saying goes, "he who saves one man saves the world".  

Part of the reason I raised this is that there seems to be a sort of common ground in that the WJC in 1905 and  Hamas today officially reject anything other than dominion over the land and holy sites and are/were unwilling to compromise their aspirations for shorter term solutions.