Well my dream is this:
the Prince of Beira marries a princess (descendant from Queen Maria II), I've got nothing against commoners ascending to the throne...but...
...oh and of course Monarchy is restored...
The future Duke of Oporto marries Leonor
For Maria Francisca I would want Prince Joseph Wenzel of Liechtenstein... 
So, you want a descendant of Queen D. Maria II to marry D. Afonso.
Let’s see who we can get

.
D.Afonso was born on March, 25th, 1996
http://geneweb.inria.fr/roglo?lang=pt&m=D&i=208199&v=7&t=L&bd=0&color=We’ll have to search amongst the descendants of Infanta D. Maria Ana, pss of Saxony and Infanta D. Antónia, Pss of Hohenzollern-Sigmaringen.
Or both since some inter-married

!
The first candidate when you scroll down the descendants of D.Maria II is Maria Teresita of Saxony.
She’s the daughter of the Heir-Prince of Saxony. Her mother may be a Wittelsbach but her father is “just” a Afif-Gesaphe of Lebanese origins :-/.
Then appears the youngest daughter of the Cr.Prince of Hohenzollern-Sigmaringen, Antonia.
She is one year older, and the descendant of the two sisters.
Or her cousin Victoria, daughter of the Crown-Prince younger brother.
Next would be Pss. Carolina of Ortenburg, dau. of Désirée H.Sigm. That would bring some Swedish blood to the Braganças (and may be the looks of Pss. Madeleine

for their daughter). But aren’t they Lutheran ?
One cannot forget the grand-daughters of AD Josef of Habsburg and Pss.Maria of Loewenstein, good friends and double relatives of D.Duarte (and they live in Portugal)
Elizabeth (dau. of Josef and Margaret von Hohenberg), her cousins Célina and Florina (although I don’t like particularly their names

– sorry if there are any members with that name).
And , of course, all those Habsburgs, descendants from D. Maria II and D. Miguel.
The obvious would be ADss Gloria with the same name as D. Maria II da Glória.
Would you settle for the grand-daughter of the -let’s call him eccentric

, and extremely rich

Baron Thyssen ?
Or would you prefer her higher born cousin Szofia ?
Or A.Dk Lorenz and Astrid of Belgium’s daughter Maria-Laetitia , A.Dss Constanza and Pr. Auersperg’s daughters Ladislaya and Leonora, A.Dk Carl-Peter’s daughter Antonia, or, my favourites

, the daughters of A.D. Simeon and Pss. Maria of Bourbon-Siciliy Isabella and Carlotta.
Down the Habsburg line, the daughter of the ravishing A.Dss Sophie

, Larissa von Windischgraetz
Why don't we make a poll and select the future duchess of Bragança

?