I have worked on several of machines in a few different shops. Most of the time with little or no budget. You have options as most manufacturers print their part number and the number of the original part manufacturer. Often you can search both sets of numbers and find the screen somewhere. There is a pretty good chance that the screen came from a small hand full of companies.
If you have no clue on the screen, you can call a service and repair company.
I have sent a few touchscreens to this company for repair. They have replaced one and repaired two. The repairs were less scratch than buying the replacement from the company that made the machine.
http://www.acsindustrial.com/touch-screen-monitor-repair.php
On a tangent, some machinery is Windows based or DOS based. Often these machines will allow for connection of a keyboard or mouse. Usually they are PS-2 or USB connections and almost always plug and play.
P.S. Say hi to Mr. Chauncy for me.