I took it a step further and I got a Staton rear wheel with a left side freewheel.
When pedaling the bike around the only drag there is is the left side freewheel... freewheeling.
The SBP shift kit sprockets have the same bolt pattern as the backwards left side freewheel from Staton so sourcing sprockets is easy. I recently ordered a 60 tooth sprocket from Kings Sales and Service drilled for the SBP setup and it matched up perfectly (which is how I learned that they are a perfect match).
By the way, Kings sprockets are very well made and look beautiful, I highly recommend them.