The Portuguese-Brazilian Empire. I could see them participating strongly in the "Scramble for Africa".
They would probably participate in greater strength and at a quicker pace.
Portuguese Congo would be interesting, they could link the colonies of Angola and Mozambique near IOTL Rhodesia...
It could work

.
If the Royal House remained in Brazil and ruled their empire from Rio de Janeiro, making Portugal a dependency, we could teoretically see an independist revolution in Portugal which might or might not give us an earlier Republic of Portugal and a surviving Empire of Brazil...
Without a parliament, or with a weak parliament, that might happen after a reasonable time because of the Crown being able to send more troops to quell the unrest, although republicanism would take a long time to take hold.
It would be more likely to see stronger Absolutist and radical liberal movements. Time works against Absolutism, and the support would eventually, after several decades, go to a strengthened radical liberalism (
Vintistas/Setembristas) or moderate liberalism (
Cartistas). The
Vintistas would be winners in the long term, picking eventually a more liberal Braganza Prince (or one of its cadet branches). Portugal could become an earlier Republic or stay as a separate Kingdom in the scenario of an independentist revolution in Portugal, depending on how the liberals could solve the problems of the country.
Things might even end (after Absolutist ideas lose strength) with the radical and moderate factions inside the
Vintistas becoming the dominant parties, and
Cartistas and Republicans as minor/medium-sized parties or factions inside the major parties.
This is worth a TL...

I feel the same too.

