Don't flame me for the idea but....
Couldn't you unpack a vc game, remove all the files other than the ticket itself and replace them with blank files, then repack it as a .wad file using the Blaze packer so you get a "good" ticket? It would install an empty channel and the ticket, then you would have to delete the channel using the wii channel browser so that the ticket would still be there. Just like when you delete purchased virtual console games from the Wii shop it would allow for redownload. Seems like alot of work, but even if the channels weren't deleted then they wouldn't take up hardly any space at all.