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This may be an option for you Dave, depending on how deep you want to get into fabricating a solution:http://www.worldofward.com/rotarycontroller/There is a ready-made option for the controller board and display and they source a keyboard as well. You'll still need to do an enclosure and source a stepper motor and matching driver.I've no affiliation other than being a happy user of this controller after building one from parts to drive my 6" table. It works as advertised and did so "right off the bat".Charlie
There i s a very active thread over on https://www.homemodelenginemachinist.com/threads/arduino-rotary-table-for-dummies.26744/page-9#post-308995. This one uses Arduino, which is an extremely well supported micro controller. It should be a lot less expensive than Division Master or the Sherline controller.