I hope this is not true, but if it is I must say it is a colossally stupid idea. I do not have the expertise to judge the success of such attempts in Iraq or Afghanistan, but such an approach does not have a great track record of success in Yemen. In fact, it has no record of success. Just ask the Saudis anytime from, well, the 1960s to today, or ask the Brits in the 1960s. Tribal leaders in Yemen would certainly take the money, but the US would get little return on its money.
Having allies and buying clients in Yemen does not translate into unqualified support or allegiance. Instead, the money and aid can only buy a type of passivity that is closer to silence and non-aggression than it is to support, and often not even that.