Alto is primarily for the Viola, the viola d'amore uses a great range of clefs depending on the music... including the Grand Staff! In my sort of music, I play from original scores generally... there are many many many clef types...

As for recordings of the piece "Rittrato dell'amore" by Couperin, there aren't any YouTube recordings that would whole heartedly recommend. This one (from a playlist that has the whole 8 or so movements) is the best that I could find, but I find it too ponderous...

I normally play in the Historical Style (also known as Early Music) on Violin, Viola and Viola d'amore. I'm decently proficient on all of them (well, at least people don't throw hard things at me when I play...), touring around the world with various groups and ensembles... I don't think I'm listed on Wikipedia!