It is impossible. From the north border with Canada until the south of Patagonia the us had no scruples into crushing down opposition governments at the time, Huerta would end crushed if he does not get on the US good side.
The trick, then, naturally, is to get Huerta on the North's good side. Really, all you have to do for that is keep Wilson out of the White House. Wilson's moralism was offended by Huerta's bloody-handed tactics; the actual Ambassador on the ground was, if not directly involved in Huerta's coup, at least politely indifferent to it. A different administration -- a continued Taft one, for instance, or a different Democratic candidate -- may well permit Huerta to continue, including allowing him to continue to receive German arms.
Also, I'll point out that the US didn't "crush" the Mexican opposition: the intervention at Veracruz was disruptive but not destructive, and Pershing's expedition didn't accomplish its goals. In the end, Huerta fell because he was defeated by Mexicans.
I'd offer the possibility that a different administration avoids entering Mexico, German arms and British and American money prop up Huerta as a "necessary evil", and ultimately it's settled over a negotiating table a la the ABC Conference of 1914. Several of the rebels get defeated on the battlefield, and the rest fade away to become more annoyances than open armies in rebellion.