By the way, I don't know which were your sources, but when it was formed, the Légion Portugaise had initially the following composition (February/March 1808):
* Line Infantry regiment nº 1 (2 battalions)
* Line Infantry regiment nº 2 (2 battalions)
* Line Infantry regiment nº 3 (2 battalions)
* Line Infantry regiment nº4 (troops were enough to form only 1 battalion)
* Line Infantry regiment nº5 (2 battalions)
* Cavalry regiment nº 1
* Cavalry regiment nº 2 (never marched to France, remaining in Lisbon to support the French troops)
* Cavalry regiment nº3 (changed the name to nº2 after the Sintra Convention in August 1808)
* 1 squadron of Light Cavalry (Caçadores a Cavalo) (divided by the 2 cavalry regimentts in France after the Sintra Convention in August 1808)
* 1 Light Infantry battalion (Caçadores)
So, in order to be historical, you should have:
2 Cavalry regiments
5 Line Infantry regiments
1 Battalion of Caçadores
Regards,
António