I bought a nice little old Gustav Emil Ern slicing knife that I plan to refurb, as I gain more confidence replacing handles. My problem is that it's got some typical recurve action in the profile near the bolster and a bit of a bird's beak on the tip. Is there a faster way to rough these out than just going to town with a Bester 500? I've got a dinky little 1x30" belt sander, an angle grinder, and a 5 or 6" bench grinder. Are any of these powered solutions safe to use without ruining the steel?