AHC: Make the Liberal Triennium work

Inspired by TheRealAndOnylGaru's TL, in which Coronel Rafael De Riego doesn't revolt against the crown and instead leads an expedition to Latin America, I have been wondering, how could the Liberal Triennium (a period of 3 years in the modern history of Spain between 1820 and 1823, when a liberal government ruled Spain after a military uprising in January 1820 by the lieutenant-colonel Rafael de Riego against the absolutist rule of King Ferdinand VII) could have worked and survived, avoiding the French intervention known as the Hundred Thousand Sons of Saint Louis? Basically, I am asking for one event that could have made the Liberals stay in place, like a POD.
 
Would it necessarily have been Riego not being there to make it work? Maybe if the events had been delayed to 1829, where France wouldn't be able to send a reactionary expedition (considering the 1830 Revolution there), it might've worked?

But a lot of what killed the Liberal Triennium was foreign intervention, so it isn't Spain's fault it failed.
 
Would it necessarily have been Riego not being there to make it work? Maybe if the events had been delayed to 1829, where France wouldn't be able to send a reactionary expedition (considering the 1830 Revolution there), it might've worked?

But a lot of what killed the Liberal Triennium was foreign intervention, so it isn't Spain's fault it failed.

So the POD would be that Ferdinand VII doesn't ask for help to the Hoyl Alliance, so no Congress of Verona and subsequently the Hundred Thousand Sons of Saint Louis expedition never happen. Right?
 
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