WI: Portuguese independence in 1820

In OTL, the Liberal Revolution of 1820 resulted in return of the monarchy to continental Portugal, and the formation of a constitutional monarchy.

What if the monarchy stayed in Rio de Janeiro, not taking the uprising seriously enough and/or more willing to risk the loss of Portugal than the loss of Brazil? And a new republic is formed in Portugal?

Possible results:

The Kingdom refuses to accept Portuguese independence and retains the name UKPBA.

>Do the European powers recognize the new Republic of Portugal, or remain recognizing the UKPBA's claim to the land?
>Are the colonies of Angola, Azores, and Mozambique more successful than IOTL?
>What's the informal name for the UKPBA? Brazilian Empire?
>Does it remain a monarchy to the present day?
>Who does the new Republic of Portugal ally with?
 
The european powers not very happy with the liberal revolutionary wave in southern Europe in the 1820's, and that was the point of the Treaty of Verona and others that followed, leading to intervention in the Two Sicilies and Spain. And those were comstitutional monarchies. A republic wouldn't be tolerated at all, I'm afraid. The only power oppossed to these interventions was Britain...not sure if at this point they will want to risk a war in order to deffend portuguese liberals,
 
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