I had some considerable correspondence on this, in another place, as to whether it would be possible to really save some time doing this with a 78 turntable and a double speed cassette deck. The only real problem was that you couldn't get a cartridge that would catch the higher frequencies.

With 1200 LP's and 800 cassettes, it seemed like a good idea at the time.

In practice, doing them at ordinary speed led to a wave of nostalgia: "I haven't heard this for years, it's really good or, what the hell did I ever see in this". Well worth the time spent and it's probably going to save much time in finding and correcting scratches and clicks in real time.