If I was going to go for a double bevel I would use tape. Tim Zowada had, and maybe still has, his method on his website. This involved beginning with one layer and continuing with that until the end when you go to 3 layers to do the double bevel. It is worth noting that Tim posted that he was giving up the double bevel. He said he was going to update the site to reflect that but I haven't checked nor has he posted on it since then AFAIK.

The problem I would expect with doing a double bevel using alternate pressure rather than tape would be inconsistency. Maintaining consistent pressure throughout the stroke would be very difficult IMO. The difference in stiffness of individual blades would come into play as well. OTOH, I don't care for double bevels so it isn't an issue for me.