I was thinking of this too. I have the Saunders standard easel and a few other ones. I used to use fixed size easels since they are easy. But some of the standard sizes are too small for my standard photo frames. So I had to get more print from the borders. I tried a couple of things and all work fine.
I have an old easel that there is a knob used to adjust size of the borders. So I adjusted the borders to be very thin, 1/4 or smaller if you like. I also used a 4 bladed easel (like the Saudners) and set the borders to be thin too.