Your only option is to set up a bouncer that isn't on the Tor network and have your IRC Scraper configuration connect to it from Tor. Lots of people get a small, cheap VPS somewhere to host ZNC for them so the buffer stays active while they do maintenance or if their local internet connection drops out so they don't miss Pres. Just make sure you don't leave ports wide open or SynIRC will ban you for proxying. Provided its well defended and for personal use, they don't care if you run a bouncer. Probably best to tunnel to your bouncer rather than do a direct connect as you'll never know what IP to permit from the Tor network.