Hi Dave,
I can confirm that the depots of the 6th Ligne and 22eme Leger remained in Rome, and were slightly augmented with new conscripts by the end of 1813, but did not receive a new draft in January 1814, as this draft was held up by Murat's Napolitans (source: Adriaan Francois Meijer, commander of the 2eme Etranger, who was shut up with the 6eme and 22eme in the Fortress San Angelo in Rome from January 1814 until the end of the war, and who was appointed drillmaster of the recruits of the 6eme and 22eme).
Cheers,
Bas