Looking for experts to help install & upgrade CNC Controller Software

We are manufacturing company in Texas, USA that uses 70 different CNC machines that use propitiatory controllers & software. Looking for an expert to help with understanding what we have and proposing controller hardware and software solutions.

Unless the machines are quite old with obsolete or unreliable controls. I don't think I would recommend gutting functional machines, to swap in Linuxcnc (or any other aftermarket controller for that matter) especially in a large commercial setting. For the #1 biggest reason, you would be burning the technical support bridge with the machine's original manufacturer, and that is a very important feature of most commercial machinery.

The problem of trying to maintain a code base of parts for multiple machines seems trivial by comparison. Often there can be tricks or workarounds that can be used to make the same g-code programs work for multiple machines with slightly different coding requirements. Such as using sub-programs and/or macro calls to issue machine specific preamble or tool change codes. Or using conversion scripts when loading part programs.