I wonder if you got anywhere? I'm not going to have time to look into this today.
However I have managed to get hold of the following Loquendo voices....
Loquendo TTS - Simon (Uk English)
Elizabeth (Uk English)
Dave (US English)
Kenneth (US English)
Loquendo TTS - Saskia (Dutch)
Sophie, Bernard, Juliette (French)
Stefan, Ulrik (German)
Afroditi, Artemis (Greek)
Paola, Roberto (Italian)
Gabriela (Portugese - Brazil)
Amalia (Portugese - Portugal)
Diego, Francisca, Esperanza (Spanish - S/A) America)
Jorge, Juan, Carmen (Spanish - Spain)
Jordi, Montserrat (Catalan)
Annika (Swedish)
Linlin (Chinese)