Already insurrectionary leaders like Miranda were seeking assistance from the Americans.

There were in New Orleans a number of exiled Mexicans who were very anxious to raise some force with which to invade Mexico, and there erect the banner of an independent sovereignty.
The bolder spirits among the Creoles found much that was attractive in such a prospect; and reckless American adventurers by the score and the hundred were anxious to join in any filibustering expedition of the kind.

They did not care in the least what form the expedition took.

They were willing to join the Mexican exiles in an effort to rouse Mexico to throw off the yoke of Spain, or to aid any province of Mexico to revolt from the rest, or to help the leaders of any defeated faction who wished to try an appeal to arms, in which they should receive aid from the sword of the stranger.

Incidentally they were even more willing to attempt the conquest on their own account; but they did not find it necessary to dwell on this aspect of the case when nominally supporting some faction which chose to make use of such watchwords as liberty and independence.
Burr's Conspiracy.
Under such conditions New Orleans, even more than the rest of the West, seemed to offer an inviting field for adventurers whose aim was both revolutionary and piratical.