Indeed, there's a lot of non-Rinoa footage out there... Most of it is machines, but it's there, and workable. Particularly the ending (all three parts), I'd wager.
*checks plotbunny file* I don't have any ideas on backup, except one mildly parodic romance to The Smiths' "Girlfriend in a Coma" which'll never get made at this rate.
But that's technically romance.
At any rate, though eight hundred million vids have already been made (including my godawful inclusion), steer clear of "awwww Riona & Squal R SOOOOOOO KAWAIIIIIIIIIIIIIIIIIIIIIIII!!!!!!!!!!!111" and you're a bit ahead of the pack.