1) I do not own a Buddha so I do not know, however, herb will never go into the heater cover unless someone blows into the tubing.
2) What is a PITA?
3) I cannot answer your question, but I can tell you that I was a bit iffy on the glass knobs, too, at first. I thought it looked too stand-out and that it didn't suit the vaporizer. Once I got mine, I realized I was wrong. It looks amazing and feels very nice. I never have or never had problems setting the temperature, the blob is accurate enough. I assume that you can just pop off the knob from DBV and attach it to the SSV because I believe the custom knobs for both are the same, but I will let someone else field that. Of note, there's a reason they do not have a temperature scale on the unit. The temperature is dependent largely on the user and how hard they inhale due to the velocity with which the air moves through the heater.
Sorry if all this is too rudimentary to help you, but I have no idea who you are!