Who doesn't like old school? The only way to be true old school is to buy real Hammond and real Leslie. Every other option is just an approximation.I'm all old school, I like the Hammond + Leslie sound.
I was imagining not stereo, but woofer and tweeter outputs from the rotary cabs. Now that I imagine stero, FV-1 can do that as well if you use both outputs.I would recommend the Boss RT-20 Rotary Ensemble. It's very good and you can find them used for about $150. Any Leslie simulator will sound much better in stereo.
You can add a 2 speed switch to just about anything, including the speed up and slow down effect, using the Geofex LERA:
I watched the same video, and thought "what a crappy way to demo a keyboard effect" (using a guitar).I listened to the ProGuitarShop demo of the SpinCycle and I thought it sounded awful. And Andy can make anything sound good. That being said, I'm sure the DSP involved is quite complicated. There's just so much involved in the sound that needs to be simulated, which is why rotary pedals cost the big bucks.