duckmilk

You could leave them proud and lightly sand the edges kinda like Greene & Greene style. 

Good call Duck!  I was looking at the joints this morning and think this is the answer.  Having the protruding ends eased will eliminate any concern that it will look unintentional.  I think I'll use a sanding block and knock the sharp edges off with a chamfer to the same depth as the protrusion.  It's a lot of fingers to sand but I think it's worth the time.  Should only take about 2 beers 😉