Actually, that Ebay drive accepts PWM:

   - *2 programable controlling modes with the red switch:* Potentiometer , 
   PWM input + Serial communication with TTL or the optional RS232/485 boards  
       

If you look at the green terminal block there is a PWM terminal and a F/R 
terminal. I'd ask the seller for documentation because you might be able to 
run it straight from the BB pwm with a separate reverse output

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