John C. turned me on to these type of grinders. They are also known as rotary or flex shaft tools and are often used by jewelers. They are electric and pretty quiet though they can spin up pretty high. You hang the motor close to your work and use the flex shaft and tool holder to do the shaping. You can control them with a foot pedal.

The shank on the burr in the pic would be too short to port heads with but you can use most any burr you want, they attach like any other grinder with a collet.

The tool holder makes it easy to use, you have relatively finite control.

Mine is a Dumore but there are other brands out there that do the job.