Any machinist with a lathe and half a brain can cut a groove in the new cam. Be sure to use a cutter bit with a radius on the nose of the tool to prevent making square corners at the bottom of the groove. Supplying enough oil volume to keep the lifters pumped up might be difficult without a groove to supply constant pressure and a wide enough channel for sufficient oil flow. You'll still need to "connect the dots" on the bearing to allow oil to flow to one bank of lifters. I'd be concerned about the narrow rear bearing maybe exposing oil passages that the wider one would cover.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!