the closets thing out of the box is likely the MR G organ preset in sampleverse. Its not a B3 but really a different type of organ but we have B3 sounds on our list for the future so stay tuned. Another option would be to make something in sampleverse. Starting with the stock sine oscillator is a good starting point. use a few sine wave oscillators and you can adjust the phase and customize the wavform a little on one of them to taste to get some of the harmonics you would want from a drawbar. Adjust envelopes to taste and then apply the LFO to the fine tuning of the oscillators at a small percentage. adjust LFO speed to get a leslie type of vibe. Of course this is a simple take on a really complex instrument (b3 and leslie) but a cool starting point.