Interesting. Where can this single side safety be purchased? I've never heard of one and would be interested to see a link so we could get them.
Assuming that this can't be found, it's not hard to modify your existing thumb safety.
Cut off the paddle where it bends to go through the frame. Be sure not to cut the part indicated by the red arrow. That is the actual part that blocks trigger movement.
The drawback to this mod is that you will have a small hole where the safety passes through the frame. As you can see from this pic...
...the frame plug interferes with the operation of the safety.
It's only an aesthetic issue and won't interfere with the function of the gun.