IMO, it is a big midtake to seed some inactive torrent on other tracker unless u r sure that the file will be 100 % hash cheking which in ur case wont!
In
scc, most of files r rar archived whereas in hdc, they r unrared. so if u even unrar ur file to seed in hdc, due to the absence of seeder in hdc, the file wont be completed to 100 % and seeding wont start.
I am not sure how u can solve it if there is any!
Back to ur question: do u have any other client running on ur box? i mean rtorrent? If no, it will be difficult to unrar file in deluge. If u have rtorrent running in ur box, use the unrar plugin in that clinet to unrar the file downloaded from
scc. Then add the torrent from hdc to deluge and give it the same path where u saved ur file. If u do it right, deluge will start the checking process and after completion, it will start to seed:)