It can be done. For this demonstration, I'm using the SMF Shavemac Brush and Classic Shaving Lime Coconut Soap.
Sorry for the poor lighting but my bathroom is not very well suited to taking pictures. Here is the photo of my arm being lathered at time zero.
Yes there is some small air bubbles in the lather, but I can assure you that the lather is nice and moist. I also did not use a bowl to generate lather as some people do. I simply soaked my brush in hot water, shook out the excess water, and made five swirls on top of the soap cake. I then generated the lather in my palm and painted 5 strokes on my arm and started the timer. Here is what it looked like 5 minutes later.
My buddy Roux (the cat) decided to join in as he always sees Ron's buddy in his SOTD pics. Notice on the above photo that I have more lather in the palm of my hand than I did in the first pic. It's just that I closed my hand at some point during the five minutes, but if you pay close attention to my arm, you'll notice that the patterns in the lather are the same as they were at time zero. Yes, there was some drying of the lather, but nothing to significant. So Joel, I'm not so sure what you're problem with these soaps are. Maybe you have an older soap. Ray did tell me that the lime/coconut scent was from his new batch of soap. The soap that I used in these pics was purchased around 4 months ago, melted in the microwave and poured into an anchor hocking glass bowl as per Randy Taylor's instructions. Maybe different soaps lather differently. This is the only shave soap that I have ever used from Ray.
"Better to keep your mouth closed and appear a fool, then to open it and remove all doubt." --Mark Twain