What if the Soviets aren't willing to pour all kinds of aid into China; say there's a Sino-Soviet split right at the get-go. Now, it's very unlikely that Mao will go begging to the Americans, but still a more open policy to attract foreign assistance might not be far fetched. China may increase its links to the rest of the non-aligned world (Egypt, India, etc.) and would probably make a greater effort to attract overseas Chinese. Thus, we would see a "United Front" that's at least a little more than the window-dressing it quickly became in OTL.
Speaking of the United Front, maybe the Hundred Flowers movement could have lasted longer if it was more subtle and especially more institutionalized. I imagine Mao and his fellow leaders would get a lot less panicky if instead of receiving a flood of complaints from every side, these complaints were aired in internal forums (possibly shielded from the public view) in a bureaucratic fashion. So instead of encouraging people to write newspaper articles and big-character posters, suppose they just called a couple more meetings of the People's Political Consultative Congress and added a few more intellectuals to the ranks of the democratic parties.